JpGU-AGU Joint Meeting 2017

Presentation information

[EE] Poster

A (Atmospheric and Hydrospheric Sciences) » A-CG Complex & General

[A-CG46] [EE] Satellite Earth Environment Observation / Satellite Based Remote Sensing of Weather, Climate, and Environment

Sat. May 20, 2017 10:45 AM - 12:15 PM Poster Hall (International Exhibition Hall HALL7)

convener:Riko Oki(Japan Aerospace Exploration Agency), Allen A Huang(University of Wisconsin Madison), Gail Skofronick Jackson(NASA Goddard Space Flight Center), Yoshiaki HONDA(Center for Environmental Remote Sensing, Chiba University), Paul Chang(NOAA College Park)

[ACG46-P37] Remotely sensed global distribution of debris thermal resistance on glaciers

*Orie Sasaki1, Yukiko Hirabayashi2, Shinjiro Kanae1 (1.Tokyo Institute of Technology, 2.The University of Tokyo)

Keywords:debris-covered glacier, thermal resistance

Supraglacial debris is commonly found in high relief mountains and affects glacier melting rate by altering surface reflectivity and conductive heat flux. Several researches therefore developed local glacier models that reflect debris effects. However, there is no global glacier model that includes debris effects in glacier melting process due to limited information about spatial distribution and thermal properties of debris. Here, we present a global distribution data of debris thermal resistance to account for debris effects in global glacier models. We calculated thermal resistance of debris layer at 90m horizontal resolution on a global scale by utilizing ASTER and CERES satellite products in conjunction with meteorological data, excluding Greenland and Antarctica. Result indicated that 16.8% of total glacier area was covered by supraglacial debris, and regional differences are apparent from region to region. When we classified debris into thin debris and thick debris, it was found that thick debris-covered area was larger than thin debris-covered area, with the exception of Svalbard and Scandinavia. Moreover, we assess the possible uncertainties and limitation of our methodology. Although the uncertainties is relatively high, our estimation provides a necessary basis to calculate the debris effects on glaciers on a global scale, which may refine future predictions of glacier meltwater and its contribution to regional water availability and global sea-level change.