skip to main content

DOE PAGESDOE PAGES

Title: Evaluation of Greenland near surface air temperature datasets

Near-surface air temperature (SAT) over Greenland has important effects on mass balance of the ice sheet, but it is unclear which SAT datasets are reliable in the region. Here extensive in situ SAT measurements ( ∼  1400 station-years) are used to assess monthly mean SAT from seven global reanalysis datasets, five gridded SAT analyses, one satellite retrieval and three dynamically downscaled reanalyses. Strengths and weaknesses of these products are identified, and their biases are found to vary by season and glaciological regime. MERRA2 reanalysis overall performs best with mean absolute error less than 2 °C in all months. Ice sheet-average annual mean SAT from different datasets are highly correlated in recent decades, but their 1901–2000 trends differ even in sign. Compared with the MERRA2 climatology combined with gridded SAT analysis anomalies, thirty-one earth system model historical runs from the CMIP5 archive reach  ∼  5 °C for the 1901–2000 average bias and have opposite trends for a number of sub-periods.
Authors:
ORCiD logo [1] ;  [1]
  1. Univ. of Arizona, Tucson, AZ (United States). Department of Hydrology and Atmospheric Sciences
Publication Date:
Grant/Contract Number:
SC0016533
Type:
Published Article
Journal Name:
The Cryosphere (Online)
Additional Journal Information:
Journal Name: The Cryosphere (Online); Journal Volume: 11; Journal Issue: 4; Journal ID: ISSN 1994-0424
Publisher:
European Geosciences Union
Research Org:
Univ. of Arizona, Tucson, AZ (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES
OSTI Identifier:
1367939
Alternate Identifier(s):
OSTI ID: 1429318