Weather on <scp>Mount Everest</scp> during the 2019 summer <scp>monsoon</scp>

Khadka, Arbindra; Matthews, Tom; Perry, L. Baker; Koch, Inka; Wagnon, Patrick; Shrestha, Dibas; Sherpa, Tenzing Chogyal; Aryal, Deepak; Tait, Alex; Sherpa, Tenzing G.; Tuladhar, Subash; Baidya, Saraju K.; Elvin, Sandra; Elmore, Aurora C.; Gajurel, Ananta Prasad; Mayewski, Paul Andrew

doi:10.1002/wea.3931

Cited by 9 publications

(6 citation statements)

References 11 publications

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“…According to meteorological data, the summer monsoon brings significant changes to the Nepal Himalaya (Khadka et al ., 2021), and herein, we show that the monsoon's departure brings equally significant changes once more. One noticeable difference is the absence of cloud cover during the post‐monsoon season, as suggested by AWS measurements of incoming shortwave radiation and downward longwave radiation measured by the Camp II AWS (Figures 3a,b).…”

Section: Figuresupporting

confidence: 68%

Mount Everest's photogenic weather during the post‐monsoon

Grey

Johnson

Matthews

et al. 2022

Weather

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Section: Figuresupporting

confidence: 68%

Mount Everest's photogenic weather during the post‐monsoon

Grey

Johnson

Matthews

et al. 2022

Weather

Self Cite

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“…According to meteorological data, the summer monsoon brings significant changes to the Nepal Himalaya (Khadka et al, 2021), and herein, we show that the monsoon's departure brings equally significant changes once more. One noticeable difference is the absence of cloud cover during the post-monsoon season, as suggested by AWS measurements of incoming shortwave radiation and downward longwave radiation measured by the Camp II AWS (Figures 3a,b).…”

Section: A Sense Of Urgency In the Latest Ipcc Assessment Reportsupporting

confidence: 56%

Weather, Vol. 77, no. 5, May 2022, pp. 154–192

2022

Weather

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“…Above the ELA, accumulation is strongly influenced by snow avalanching and is insensitive to altitude (Benn & Lehmkuhl, 2000). The upper slopes of Sagarmatha remain largely snow‐free in the pre‐monsoon season due to low winter precipitation and extreme wind speeds close to the tropopause (Khadka et al, 2021). The mass balance gradient is highly relevant to why the structure of the lower glacier alters between tributary‐dominated and Main Divide‐dominated ice flow (Figure 8).…”

Section: Discussionmentioning

confidence: 99%

Provenance and transport of supraglacial debris revealed by variations in debris geochemistry on Khumbu Glacier, Nepal Himalaya

Kirkbride

Sherriff

Rowan

et al. 2023

Earth Surf Processes Landf

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The origin of supraglacial debris covers is often conceptualised as the formation of a surface lag by melt‐out of englacial debris from slow‐moving ice, where complexity arises from feedback between debris thickness and sub‐debris ice melt. Here, we examine the origin of a debris cover from the perspective of debris provenance and changing tributary supply in a high‐elevation compound valley glacier. Geochemical analysis of 11 major elements in 21 debris samples from six tributaries of Khumbu Glacier (Nepal) shows unambiguous statistical differentiation of debris sources reflecting lithological differences between tributary catchments. Twenty‐four samples from transects across the ablation area are partitioned according to their source areas using the FR2000 sediment unmixing model. We estimate the age of ice at each transect using a higher order ice flow model. The results show greater proportions of debris from lateral tributaries in downglacier locations that have experienced longer flowline histories. More recently, ice from the Main Himalayan Divide (Western Cwm) has become relatively more important. This suggests a change in the state of the lower glacier's structure depending on the relative ice discharges of lateral and divide sources. Ice flux from lower elevation tributaries was more important probably prior to a weakening of the Indian Summer Monsoon at around 1420 CE. The lower elevation tributaries lie within the range of late Holocene equilibrium line altitude variation and therefore respond most sensitively to climatic drivers of the glacier's flow structure. Negative glacier mass balance since around 1900 CE caused tributary glaciers to detach and high‐elevation catchments to re‐establish as the dominant ice source to Khumbu Glacier.

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Weather on Mount Everest during the 2019 summer monsoon

Abstract: Figure 3. Mean air temperatures and pressures recorded at the AWSs during the respective periods. The lines show moist adiabats (green) and dry adiabatic (grey) LRs.

Cited by 9 publications

References 11 publications

Mount Everest's photogenic weather during the post‐monsoon

Mount Everest's photogenic weather during the post‐monsoon

Weather, Vol. 77, no. 5, May 2022, pp. 154–192

Provenance and transport of supraglacial debris revealed by variations in debris geochemistry on Khumbu Glacier, Nepal Himalaya

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