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Micrometeorological Conditions and Surface Mass and Energy Fluxes on Lewis Glacier, Mt Kenya, in Relation to Other Tropical Glaciers : Volume 6, Issue 6 (14/12/2012)

By Nicholson, L.

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Book Id: WPLBN0004022779
Format Type: PDF Article :
File Size: Pages 44
Reproduction Date: 2015

Title: Micrometeorological Conditions and Surface Mass and Energy Fluxes on Lewis Glacier, Mt Kenya, in Relation to Other Tropical Glaciers : Volume 6, Issue 6 (14/12/2012)  
Author: Nicholson, L.
Volume: Vol. 6, Issue 6
Language: English
Subject: Science, Cryosphere, Discussions
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Mölg, T., Kaser, G., Nicholson, L., & Prinz, R. (2012). Micrometeorological Conditions and Surface Mass and Energy Fluxes on Lewis Glacier, Mt Kenya, in Relation to Other Tropical Glaciers : Volume 6, Issue 6 (14/12/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: Center for Climate and Cryosphere, Institute of Meteorology and Geophysics, University of Innsbruck, Innrain 52, Innsbruck, Austria. The Lewis Glacier on Mt Kenya is one of the best-studied tropical glaciers, but full understanding of the interaction of the glacier mass balance and climate forcing has been hampered by a lack of long term meteorological data. Here we present 2.5 yr of meteorological data collected from the glacier surface from October 2009–February 2012, which indicate that mean meteorological conditions in the upper zone of Lewis Glacier are comparable to those experienced in the ablation zones of South American tropical glaciers. In the context of other glaciated mountains of equatorial east Africa, the summit zone of Mt Kenya shows strong diurnal cycles of convective cloud development as opposed to the Rwenzoris where cloud cover persists throughout the diurnal cycle and Kilimanjaro where clear skies prevail. Surface energy fluxes were calculated for the meteorological station site using a physical mass- and energy-balance model driven by hourly measured meteorological data and additional input parameters that were determined by Monte Carlo optimization. Sublimation rate was lower than those reported on other tropical glaciers and melt rate was high throughout the year, with the glacier surface reaching the melting point on an almost daily basis. Surface mass balance is influenced by both solid precipitation and air temperature, with radiation providing the greatest net source of energy to the surface. Cloud cover typically reduces the net radiation balance compared to clear sky conditions, and thus the more frequent formation of convective clouds over the summit of Mt Kenya, and the associated higher rate of snow accumulation are important in limiting the rate of mass loss from the glacier surface. The analyses shown here are the basis for glacier-wide mass and energy balance modeling to determine the climate proxy offered by the glaciers of Mt Kenya.

Summary
Micrometeorological conditions and surface mass and energy fluxes on Lewis glacier, Mt Kenya, in relation to other tropical glaciers

Excerpt
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