Change search
Link to record
Permanent link

Direct link
BETA
Alternative names
Publications (10 of 31) Show all publications
Singh, S., Kumar, R., Bhardwaj, A., Kumar, R. & Singh, A. (2018). Changing climate and glacio-hydrology: a case study of Shaune Garang basin, Himachal Pradesh. International Journal of Hydrology Science and Technology, 8(3), 258-272
Open this publication in new window or tab >>Changing climate and glacio-hydrology: a case study of Shaune Garang basin, Himachal Pradesh
Show others...
2018 (English)In: International Journal of Hydrology Science and Technology, ISSN 2042-7808, E-ISSN 2042-7816, Vol. 8, no 3, p. 258-272Article in journal (Refereed) Published
Abstract [en]

The rise in temperature is already evident in Himalaya with rate of increase varying seasonally and spatially. Changes in precipitation are also evident with no clear trend. Several studies in different parts of Himalayas suggest that the glaciers are retreating in general with few exceptions as response to changes in temperature and precipitation. The stream flow in river basins in Indian Himalayan region (IHR) is already showing changes in studies undertaken in the last few decades. Use of glacio-hydrological models gives opportunity to estimate stream flow in glaciated river basins and understand the changes. The present study deals with estimation of discharge in Shaune Garang Basin, Himachal Pradesh using a glacio-hydrological model based on degree day factors. The model was used to estimate long term average of melt season discharge (1985-2007) in the basin. The modelled discharge shows good correlation with measured discharge for simulation period except for first year of comparison.

Place, publisher, year, edition, pages
InderScience Publishers, 2018
National Category
Climate Research Aerospace Engineering
Research subject
Atmospheric science
Identifiers
urn:nbn:se:ltu:diva-70054 (URN)10.1504/IJHST.2018.10010353 (DOI)
Note

Validerad;2018;Nivå 1;2018-08-02 (rokbeg)

Available from: 2018-07-03 Created: 2018-07-03 Last updated: 2018-08-08Bibliographically approved
Kumar, R., Kumar, R., Singh, S., Singh, A., Bhardwaj, A., Kumari, A., . . . Saha, A. (2018). Dynamics of suspended sediment load with respect to summer discharge and temperatures in Shaune Garang glacierized catchment, Western Himalaya. Acta Geophysica, 66(5), 1109-1120
Open this publication in new window or tab >>Dynamics of suspended sediment load with respect to summer discharge and temperatures in Shaune Garang glacierized catchment, Western Himalaya
Show others...
2018 (English)In: Acta Geophysica, ISSN 1895-6572, E-ISSN 1895-7455, Vol. 66, no 5, p. 1109-1120Article in journal (Refereed) Published
Abstract [en]

The observed and predicted rise in temperature will have deleterious impact on melting of snow and ice and form of precipitation which is already evident in Indian Himalayan Region. The temperature-dependent entities like discharge and sediment load will also vary with the observed and predicted rise posing environmental, social and economic threat in the region. There is little known about sediment load transport in relation to temperature and discharge in glacierized catchments in Himalaya mainly due to the scarcity of ground-based observation. The present study is an attempt to understand the suspended sediment load and transportation in relation to variation in discharge and temperature in the Shaune Garang catchment. The result shows strong dependence of sediment concentration primarily on discharge (R2 = 0.84) and then on temperature (R2 = 0.79). The catchments with similar geological and climate setting were observed to have comparatively close weathering rate. The sediment load was found to be higher in the catchments in eastern and central part of Indian Himalayan Region in comparison with western part due to dominance of Indian Summer Monsoon leading to high discharge. The annual physical weathering rate in Shaune Garang catchment was found to be 411 t km−2 year−1 which has increased from 327 t km−2 year−1 in around three decades due to rise in temperature causing increase in discharge and proportion of debris-covered glacierized area.

Place, publisher, year, edition, pages
Springer Publishing Company, 2018
National Category
Geosciences, Multidisciplinary Aerospace Engineering
Research subject
Atmospheric science
Identifiers
urn:nbn:se:ltu:diva-70166 (URN)10.1007/s11600-018-0184-4 (DOI)
Note

Validerad;2018;Nivå 2;2018-12-05 (svasva)

Available from: 2018-07-26 Created: 2018-07-26 Last updated: 2018-12-05Bibliographically approved
Sam, L., Bhardwaj, A., Kumar, R., Buchroithner, M. F. & Martin-Torres, J. (2018). Heterogeneity in topographic control on velocities of Western Himalayan glaciers. Scientific Reports, 8(1), Article ID 12843.
Open this publication in new window or tab >>Heterogeneity in topographic control on velocities of Western Himalayan glaciers
Show others...
2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, no 1, article id 12843Article in journal (Refereed) Published
Abstract [en]

Studies of the seasonal and annual patterns of glacier velocities improve our understanding of the ice volume, topography, responses to climate change, and surge events of glaciers. Such studies are especially relevant and equally rare for the Himalayan glaciers, which supply many rivers that sustain some of the most heavily populated mountainous regions in the world. In particular, the control of the hypsometric distribution of geomorphometric parameters, such as slope, aspect, and curvature, on the dynamics of Himalayan glaciers have never been studied so far, at the river basin scale. Here, we present the degree to which topographic and hypsometric parameters affect the seasonal and annual average flow velocities of 112 glaciers in the Baspa River basin in the Western Indian Himalaya by analysing Global Land Ice Velocity Extraction from Landsat 8 (GoLIVE) datasets for the years 2013–2017. We observe, (i) significant heterogeneity in topographic controls on the velocities of these glaciers, (ii) elevation and the seasons play important roles in regulating the degree to which morphometric parameters (slope, aspect, and curvature) affect these velocities, (iii) a possible polythermal regime promoting both sliding and deformational forms of motion in a majority of these glaciers, and (iv) a detailed analysis of complex topographic controls within various elevation zones using a novel hypso-morphometric approach. These findings can help us to better model the dynamics of Himalayan glaciers and their responses to the future climatic scenarios. The inferences also suggest the need to incorporate dynamic topography in glacio-hydrological models in the wake of constant glacial evolutions.

Place, publisher, year, edition, pages
Nature Publishing Group, 2018
National Category
Aerospace Engineering
Research subject
Atmospheric science
Identifiers
urn:nbn:se:ltu:diva-70625 (URN)10.1038/s41598-018-31310-y (DOI)30150785 (PubMedID)2-s2.0-85052300710 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-08-28 (andbra)

Available from: 2018-08-28 Created: 2018-08-28 Last updated: 2018-09-07Bibliographically approved
Cockell, C. S., Martin-Torres, J., Zorzano, M.-P., Bhardwaj, A., Soria-Salinas, Á., Mathanla, T., . . . Suckling, B. (2018). Subsurface scientific exploration of extraterrestrial environments (MINAR 5):: analogue science, technology and education inthe Boulby Mine, UK. International Journal of Astrobiology
Open this publication in new window or tab >>Subsurface scientific exploration of extraterrestrial environments (MINAR 5):: analogue science, technology and education inthe Boulby Mine, UK
Show others...
2018 (English)In: International Journal of Astrobiology, ISSN 1473-5504, E-ISSN 1475-3006Article in journal (Refereed) Epub ahead of print
Abstract [en]

The deep subsurface of other planetary bodies is of special interest for robotic and human exploration. The subsurface provides access to planetary interior processes, thus yielding insights into planetary formation and evolution. On Mars, the subsurface might harbour the most habitable conditions. In the context of human exploration, the subsurface can provide refugia for habitation from extreme surface conditions. We describe the fifth Mine Analogue Research (MINAR 5) programme at 1 km depth in the Boulby Mine, UK in collaboration with Spaceward Bound NASA and the Kalam Centre, India, to test instruments and methods for the robotic and human exploration of deep environments on the Moon and Mars. The geological context in Permian evaporites provides an analogue to evaporitic materials on other planetary bodies such as Mars. A wide range of sample acquisition instruments (NASA drills, Small Planetary Impulse Tool (SPLIT) robotic hammer, universal sampling bags), analytical instruments (Raman spectroscopy, Close-Up Imager, Minion DNA sequencing technology, methane stable isotope analysis, biomolecule and metabolic life detection instruments) and environmental monitoring equipment (passive air particle sampler, particle detectors and environmental monitoring equipment) was deployed in an integrated campaign. Investigations included studying the geochemical signatures of chloride and sulphate evaporitic minerals, testing methods for life detection and planetary protection around human-tended operations, and investigations on the radiation environment of the deep subsurface. The MINAR analogue activity occurs in an active mine, showing how the development of space exploration technology can be used to contribute to addressing immediate Earth-based challenges. During the campaign, in collaboration with European Space Agency (ESA), MINAR was used for astronaut familiarization with future exploration tools and techniques. The campaign was used to develop primary and secondary school and primary to secondary transition curriculum materials on-site during the campaign which was focused on a classroom extra vehicular activity simulation.

Place, publisher, year, edition, pages
Cambridges Institutes Press, 2018
National Category
Geochemistry Astronomy, Astrophysics and Cosmology Aerospace Engineering
Research subject
Atmospheric science
Identifiers
urn:nbn:se:ltu:diva-70069 (URN)10.1017/S1473550418000186 (DOI)
Available from: 2018-07-04 Created: 2018-07-04 Last updated: 2018-08-02
Bhardwaj, A., Singh, S., Sam, L., Joshi, P., Bhardwaj, A., Martín-Torres, J. F. & Kumar, R. (2017). A review on remotely sensed land surface temperature anomaly as an earthquake precursor. International Journal of Applied Earth Observation and Geoinformation, 63, 158-166
Open this publication in new window or tab >>A review on remotely sensed land surface temperature anomaly as an earthquake precursor
Show others...
2017 (English)In: International Journal of Applied Earth Observation and Geoinformation, ISSN 0303-2434, Vol. 63, p. 158-166Article in journal (Refereed) Published
Abstract [en]

The low predictability of earthquakes and the high uncertainty associated with their forecasts make earthquakes one of the worst natural calamities, capable of causing instant loss of life and property. Here, we discuss the studies reporting the observed anomalies in the satellite-derived Land Surface Temperature (LST) before an earthquake. We compile the conclusions of these studies and evaluate the use of remotely sensed LST anomalies as precursors of earthquakes. The arrival times and the amplitudes of the anomalies vary widely, thus making it difficult to consider them as universal markers to issue earthquake warnings. Based on the randomness in the observations of these precursors, we support employing a global-scale monitoring system to detect statistically robust anomalous geophysical signals prior to earthquakes before considering them as definite precursors.

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Geosciences, Multidisciplinary Aerospace Engineering
Research subject
Atmospheric science
Identifiers
urn:nbn:se:ltu:diva-64993 (URN)10.1016/j.jag.2017.08.002 (DOI)000411848500015 ()2-s2.0-85032462154 (Scopus ID)
Note

Validerad;2017;Nivå 2;2017-08-15 (rokbeg)

Available from: 2017-08-10 Created: 2017-08-10 Last updated: 2017-11-24Bibliographically approved
Shekhar, M., Bhardwaj, A., Singh, S., Ranhotra, P. S., Bhattacharyya, A., Pal, A. K., . . . Zorzano Mier, M.-P. (2017). Himalayan glaciers experienced significant mass loss during later phases of little ice age. Scientific Reports, 7, Article ID 10305.
Open this publication in new window or tab >>Himalayan glaciers experienced significant mass loss during later phases of little ice age
Show others...
2017 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 10305Article in journal (Refereed) Published
Abstract [en]

To date, there is a gap in the data about the state and mass balance of glaciers in the climate-sensitive subtropical regions during the Little Ice Age (LIA). Here, based on an unprecedented tree-ring sampling coverage, we present the longest reconstructed mass balance record for the Western Himalayan glaciers, dating to 1615. Our results confirm that the later phase of LIA was substantially briefer and weaker in the Himalaya than in the Arctic and subarctic regions. Furthermore, analysis of the time-series of the mass-balance against other time-series shows clear evidence of the existence of (i) a significant glacial decay and a significantly weaker magnitude of glaciation during the latter half of the LIA; (ii) a weak regional mass balance dependence on either the El Niño-Southern Oscillation (ENSO) or the Total Solar Irradiance (TSI) taken in isolation, but a considerable combined influence of both of them during the LIA; and (iii) in addition to anthropogenic climate change, the strong effect from the increased yearly concurrence of extremely high TSI with El Niño over the past five decades, resulting in severe glacial mass loss. The generated mass balance time-series can serve as a source of reliable reconstructed data to the scientific community.

Place, publisher, year, edition, pages
Nature Publishing Group, 2017
National Category
Aerospace Engineering
Research subject
Atmospheric science
Identifiers
urn:nbn:se:ltu:diva-65484 (URN)10.1038/s41598-017-09212-2 (DOI)000408997700004 ()28871188 (PubMedID)2-s2.0-85028812509 (Scopus ID)
Note

Validerad;2017;Nivå 2;2017-09-07 (svasva)

Available from: 2017-09-05 Created: 2017-09-05 Last updated: 2018-07-10Bibliographically approved
Bhardwaj, A., Sam, L., Martin-Torres, J., Zorzano Mier, M.-P. & Fonseca, R. (2017). Martian slope streaks as plausible indicators of transient water activity. Scientific Reports, 7(1), Article ID 7074.
Open this publication in new window or tab >>Martian slope streaks as plausible indicators of transient water activity
Show others...
2017 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, no 1, article id 7074Article in journal (Refereed) Published
Abstract [en]

Slope streaks have been frequently observed in the equatorial, low thermal inertia and dusty regions of Mars. The reason behind their formation remains unclear with proposed hypotheses for both dry and wet mechanisms. Here, we report an up-to-date distribution and morphometric investigation of Martian slope streaks. We find: (i) a remarkable coexistence of the slope streak distribution with the regions on Mars with high abundances of water-equivalent hydrogen, chlorine, and iron; (ii) favourable thermodynamic conditions for transient deliquescence and brine development in the slope streak regions; (iii) a significant concurrence of slope streak distribution with the regions of enhanced atmospheric water vapour concentration, thus suggestive of a present-day regolith-atmosphere water cycle; and (iv) terrain preferences and flow patterns supporting a wet mechanism for slope streaks. These results suggest a strong local regolith-atmosphere water coupling in the slope streak regions that leads to the formation of these fluidised features. Our conclusions can have profound astrobiological, habitability, environmental, and planetary protection implications

Place, publisher, year, edition, pages
Nature Publishing Group, 2017
National Category
Other Physics Topics Aerospace Engineering
Research subject
Atmospheric science
Identifiers
urn:nbn:se:ltu:diva-64991 (URN)10.1038/s41598-017-07453-9 (DOI)000406764200106 ()28765566 (PubMedID)2-s2.0-85026747795 (Scopus ID)
Note

Validerad;2017;Nivå 2;2017-08-15 (andbra)

Available from: 2017-08-10 Created: 2017-08-10 Last updated: 2018-07-10Bibliographically approved
Bhardwaj, A., Singh, S., Sam, L., Bhardwaj, A., Martin-Torres, J., Singh, A. & Kumar, R. (2017). MODIS-based estimates of strong snow surface temperature anomaly related to high altitude earthquakes of 2015. Remote Sensing of Environment, 188, 1-8
Open this publication in new window or tab >>MODIS-based estimates of strong snow surface temperature anomaly related to high altitude earthquakes of 2015
Show others...
2017 (English)In: Remote Sensing of Environment, ISSN 0034-4257, E-ISSN 1879-0704, Vol. 188, p. 1-8Article in journal (Refereed) Published
Abstract [en]

The high levels of uncertainty associated with earthquake prediction render earthquakes some of the worst natural calamities. Here, we present our observations of MODerate resolution Imaging Spectroradiometer (MODIS)-derived Land Surface Temperature (LST) anomaly for earthquakes in the largest tectonically active Himalayan and Andean mountain belts. We report the appearance of fairly detectable pre-earthquake Snow Surface Temperature (SST) anomalies. We use 16 years (2000–2015) of MODIS LST time-series data to robustly conclude our findings for three of the most destructive earthquakes that occurred in 2015 in the high mountains of Nepal, Chile, and Afghanistan. We propose the physical basis behind higher sensitivity of snow towards geothermal emissions. Although the preliminary appearance of SST anomalies and their amplitudes vary, we propose employing a global-scale monitoring system for detecting and studying such spatio-temporal geophysical signals. With the advent of improved remote sensors, we anticipate that such efforts can be another step towards improved earthquake predictions.

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Aerospace Engineering
Research subject
Atmospheric science
Identifiers
urn:nbn:se:ltu:diva-60420 (URN)10.1016/j.rse.2016.11.005 (DOI)000390626900002 ()2-s2.0-84994591162 (Scopus ID)
Note

Validerad; 2016; Nivå 2; 2016-11-15 (andbra)

Available from: 2016-11-15 Created: 2016-11-15 Last updated: 2018-09-13Bibliographically approved
Bhardwaj, A., Sam, L., Singh, S. & Kumar, R. (2016). Automated detection and temporal monitoring of crevasses using remote sensing and their implications for glacier dynamics (ed.). Paper presented at . Annals of Glaciology, 57(71), 81-91
Open this publication in new window or tab >>Automated detection and temporal monitoring of crevasses using remote sensing and their implications for glacier dynamics
2016 (English)In: Annals of Glaciology, ISSN 0260-3055, E-ISSN 1727-5644, Vol. 57, no 71, p. 81-91Article in journal (Refereed) Published
Abstract [en]

Detailed studies on temporal changes of crevasses and their linkage with glacier dynamics are scarce in the Himalayan context. Observations of temporally changing surficial crevasse patterns and their orientations are suggestive of the processes that determine seasonal glacier flow characteristics. In the present study, on a Himalayan valley glacier, changing crevasse patterns and orientations were detected and mapped on Landsat 8 images in an automated procedure using the ratio of Thermal Infrared Sensor (TIRS) band 10 to Optical Land Imager (OLI) shortwave infrared (SWIR) band 6. The ratio was capable of mapping even crevasses falling under mountain shadows. Differential GPS observations suggested an average error of 3.65% and root-mean-square error of 6.32m in crevasse lengths. A year-round observation of these crevasses, coupled with field-based surface velocity measurements, provided some interesting interpretations of seasonal glacier dynamics.

National Category
Aerospace Engineering
Research subject
Atmospheric science
Identifiers
urn:nbn:se:ltu:diva-8331 (URN)10.3189/2016AoG71A496 (DOI)6d6142b0-d3e8-4e83-97ef-485aaf81f352 (Local ID)6d6142b0-d3e8-4e83-97ef-485aaf81f352 (Archive number)6d6142b0-d3e8-4e83-97ef-485aaf81f352 (OAI)
Note
Upprättat; 2016; 20160630 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Singh, S., Kumar, R., Bhardwaj, A., Sam, L., Shekhar, M., Singh, A., . . . Gupta, A. (2016). Changing climate and glacio-hydrology in Indian Himalayan Region: a review (ed.). Wiley Interdisciplinary Reviews: Climate Change, 7(3), 393-410
Open this publication in new window or tab >>Changing climate and glacio-hydrology in Indian Himalayan Region: a review
Show others...
2016 (English)In: Wiley Interdisciplinary Reviews: Climate Change, ISSN 1757-7780, E-ISSN 1757-7799, Vol. 7, no 3, p. 393-410Article in journal (Refereed) Published
Abstract [en]

This study presents a comprehensive review of the published literature on the evidences of a changing climate in the Indian Himalayan Region (IHR) and its impacts on the glacio-hydrology of the region. The IHR serves as an important source of fresh water for the densely populated areas downstream. It is evident from the available studies that temperature is significantly increasing in all parts of the IHR, whereas precipitation is not indicative of any particular spatiotemporal trend. Glacio-hydrological proxies for changing climate, such as, terminus and areal changes of the glaciers, glacier mass balance, and streamflow in downstream areas, highlight changes more evidently in recent decades. On an average, studies have predicted an increase in temperature and precipitation in the region, along with increase in streamflow of major rivers. Such trends are already apparent in some sub-basins of the western IHR. The region is particularly vulnerable to changing climate as it is highly dependent on snow and glacier melt run-off to meet its freshwater demands. We present a systematic review of key papers dealing with changing temperature, precipitation, glaciers, and streamflow in the IHR. We discuss these interdisciplinary themes in relation to each other, in order to establish the present and future impacts of climatic, glaciological, and hydrological changes in the region.

National Category
Aerospace Engineering
Research subject
Atmospheric science
Identifiers
urn:nbn:se:ltu:diva-12128 (URN)10.1002/wcc.393 (DOI)000374771500005 ()2-s2.0-84977962775 (Scopus ID)b31e2924-91fc-416d-916e-f58b30bbd9e6 (Local ID)b31e2924-91fc-416d-916e-f58b30bbd9e6 (Archive number)b31e2924-91fc-416d-916e-f58b30bbd9e6 (OAI)
Note

Validerad; 2016; Nivå 2; 20160316 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-12-14Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-2502-6384

Search in DiVA

Show all publications