Spatio-temporal variability of near-surface air temperature in the Dokriani glacier catchment (DGC), central Himalaya

Yadav, Jairam Singh; Pratap, Bhanu; Gupta, Anil K.; Dobhal, D. P.; Yadav, R. B. S.; Tiwari, Sameer K.

doi:10.1007/s00704-018-2544-z

Cited by 24 publications

(11 citation statements)

References 57 publications

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“…Whereas, the monsoon period with a comparatively high tlr of 5.6-6.8 °C km −1 shows large temperature differences between two observational sites. These observations do not agree to the study that was reported by [60] in Langtang River catchment in Nepal Himalaya and in Dokriani Glacier, Garhwal Himalaya [29], which showed lowest tlr during the monsoon period, owing to the moisture influx in the region. Even though the largest tlr were observed in summer and the lowest in During the monsoon season, variations in daily and monthly temperatures are crucial for an understanding of spatial distribution of snow cover and its melt in the catchment.…”

Section: Air Temperature and Temperature Lapse Rate (Tlr)contrasting

confidence: 95%

“…These results are similar to the air temperature that was observed over the Chhota Shigri Glacier in Chandra basin, which showed a sudden drop that was characterized by the change of summer monsoon to post-monsoon, followed by winter seasons [67]. This phenomenon was also observed in Bhagirathi basin, central Himalaya, concluding the short-lived transition phase between monsoon and post-monsoon season [29,66]. Unlike the sudden drop in Z t = 0 during the summer period of 2017, we did not find any daily variation in the summer of 2016 ( Figure 6).…”

Section: Seasonal Variability In Surface Meltingsupporting

confidence: 87%

“…The annual (October to September, a balance year) tlr between Hbc and Abc was found to be 4.2 • C km −1 . This range of lapse rate was significantly different from other basins of the Himalaya, which demonstrated the need to use localized tlr instead of the uniform environmental lapse rate (i.e., 6.5 • C km −1 ) in the region (Table 1; [29]). The tlr in the monsoon season approximately equals to the environmental lapse rate (6.5 • C km −1 ) (Figure 4b).…”

Section: Air Temperature and Temperature Lapse Rate (Tlr)mentioning

confidence: 80%

“…The spatial distribution of air temperature in the upper reaches of the Himalaya has greater value for defining the potential phase change of rain and snow and melt period, which generally tends to occur above • C isotherms Z t = 0 [28,29]. Changes in temperature isotherms as a function of elevation and time can be assessed by extrapolating lower station temperature data based on the observed tlr.…”

Section: Spatial Distribution Of Air Temperaturementioning

confidence: 99%

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Reconciling High Glacier Surface Melting in Summer with Air Temperature in the Semi-Arid Zone of Western Himalaya

Pratap

Sharma

Patel

et al. 2019

Water

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In Himalaya, the temperature plays a key role in the process of snow and ice melting and, importantly, the precipitation phase changes (i.e., snow or rain). Consequently, in longer period, the melting and temperature gradient determine the state of the Himalayan glaciers. This necessitates the continuous monitoring of glacier surface melting and a well-established meteorological network in the Himalaya. An attempt has been made to study the seasonal and annual (October 2015 to September 2017) characteristics of air temperature, near-surface temperature lapse rate (tlr), in-situ glacier surface melting, and surface melt simulation by temperature-index (T-index) models for Sutri Dhaka Glacier catchment, Lahaul-Spiti region in Western Himalaya. The tlr of the catchment ranges from 0.3 to 6.5 °C km−1, varying on a monthly and seasonal timescale, which suggests the need for avoiding the use of standard environmental lapse rate (SELR ~6.5 °C km−1). The measured and extrapolated average air temperature (tavg) was found to be positive on glacier surface (4500 to 5500 m asl) between June and September (summer). Ablation data calculated for the balance years 2015–16 and 2016–17 shows an average melting of −4.20 ± 0.84 and −3.09 ± 0.62 m w.e., respectively. In compliance with positive air temperature in summer, ablation was also found to be maximum ~88% of total yearly ice melt. When comparing the observed and modelled ablation data with air temperature, we show that the high summer glacier melt was caused by warmer summer air temperature and minimum spells of summer precipitation in the catchment.

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Section: Air Temperature and Temperature Lapse Rate (Tlr)contrasting

confidence: 95%

Section: Seasonal Variability In Surface Meltingsupporting

confidence: 87%

Section: Air Temperature and Temperature Lapse Rate (Tlr)mentioning

confidence: 80%

Section: Spatial Distribution Of Air Temperaturementioning

confidence: 99%

See 2 more Smart Citations

Reconciling High Glacier Surface Melting in Summer with Air Temperature in the Semi-Arid Zone of Western Himalaya

Pratap

Sharma

Patel

et al. 2019

Water

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“…Subjected to the geographical location, the Himalayan glaciers are known to be regulated by inter-decadal variability in the winter-westerlies and the Indian summer monsoon (ISM) (Bookhagen and Burbank, 2010;Singh et al, 2021;Perry et al, 2020;Yao et al, 2019). However, recent studies on differential rates of heating and elevation-dependent warming have highlighted the importance of local land-climate interaction and feedback processes in ice-mass variability (Collier et al, 2013;de Kok et al, 2018de Kok et al, , 2020Lau et al, 2010;Mölg et al, 2012b;Pepin et al, 2015;Rashid et al, 2020;Sigdel et al, 2020;Yadav et al, 2019;Yao et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Tree-ring oxygen isotope based inferences on winter and summer moisture dynamics over the glacier valleys of Central Himalaya

Singh

Shekhar²,

Parida

et al. 2021

Preprint

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Abstract. Accelerated glacier mass loss is primarily attributed to greenhouse-induced warming, but land–climate interaction has increasingly been recognized as an important forcing at the regional-local scale. However, the related effects on the Himalayan glaciers are less explored but believed to be an important factor regulating spatial heterogeneity. This study aims to present a multi-decadal approximation on hydroclimate and glacier interaction over the western central Himalaya (WCH). Three highly coherent, multi-species, tree-ring δ18O site-chronologies from WCH were used to derive regional changes in atmospheric humidity (atmospheric moisture content: AMC) since the last four centuries. Coherency analyses between AMC and glacier mass balance (GMB: tree-ring δ13C-derived) indicate an abrupt phase-shift since the 1960s within a common record of 273 years. To ascertain the cause of phase-shift, annual AMC was disintegrated into seasonal-scale, utilizing δ18O record of deciduous species. Seasonal (winter: October–March; & summer-accumulation season: April–September) decomposition results reveal that winter-westerlies rather than summer precipitation from Indian summer monsoon (ISM) govern the ice-mass variability in WCH. Decadal coherency between summer-season AMC and GMB remained relatively stable since the mid-20th century, despite a decline in central Himalayan summer precipitation (tree-ring δ18O records). We hypothesize that excess water vapor brought to the atmosphere through increase in pre-monsoon precipitation and greening-mediated increase in evapotranspiration might have been recycled through the summer season to compensate for the ISM part of precipitation. However, isotope-enabled ecophysiological models and measurements would be able to strengthen this hypothesis. In addition, high-resolution radiative forcing and glacier valley-scale vegetation trend analyses point towards a probable influence of greening on GMB. Results indicate that attribution of ice-mass to large-scale dynamics is likely to be modulated by local vegetation changes. We contend that glacier-climate models fed with these feedback processes could reliably improve the projections.

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Isotopic analysis to quantify the role of the Indian monsoon on water resources of selected river basins in the Himalayas

Jeelani

Shah

Deshpande

et al. 2021

Hydrological Processes

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Western disturbances (WDs) and Indian summer monsoon (ISM) led precipitation play a central role in the Himalayan water budget. Estimating their contributions to water resource is although a challenging but essential for hydrologic understanding and effective water resource management. In this study, we used stable water isotope data of precipitation and surface waters to estimate the contribution of ISM and WDs to the water resources in three mountainous river basins ‐ Indus, Bhagirathi and Teesta river basins of western, central and Eastern Himalayas. The study reveals distinct seasonality in isotope characteristics of precipitation and surface waters in each river basin is due to changes in moisture source, hydrometeorology and relief. Despite steady spatial variance in the slope and intercept of regression lines from the Teesta to Indus and the Bhagirathi river basins, the slope and intercept are close to the global meteoric water line and reported local meteoric water line of other regions in the Himalayas and the Tibetan Plateau. The two‐component end‐member mixing method using d‐excess as tracer were used to estimate the contribution from ISM and WD led precipitation to surface water in aforementioned river basins. The results suggest that the influence of the ISM on the water resources is high (>72% to annual river flow) in Teesta river basin (eastern Himalayas), while as the WDs led precipitation is dominantly contributing (>70% average annual river flow) to the surface waters in the Indus river basin (western Himalayas). The contribution of ISM and WD led precipitation in Bhagirathi river basin is 60% and 40%, respectively. The findings demonstrate that the unusual changes in the ISM and WD moisture dynamics have the potential to affect the economy and food security of the region, which is dependent on the availability of water resources. The obtained results are of assistance to policy makers/mangers to make use of the information for better understanding hydrologic response amid unusual behaviour of the dual monsoon system over the region.

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Spatio-temporal variability of near-surface air temperature in the Dokriani glacier catchment (DGC), central Himalaya

Cited by 24 publications

References 57 publications

Reconciling High Glacier Surface Melting in Summer with Air Temperature in the Semi-Arid Zone of Western Himalaya

Reconciling High Glacier Surface Melting in Summer with Air Temperature in the Semi-Arid Zone of Western Himalaya

Tree-ring oxygen isotope based inferences on winter and summer moisture dynamics over the glacier valleys of Central Himalaya

Isotopic analysis to quantify the role of the Indian monsoon on water resources of selected river basins in the Himalayas

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