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Title: Cloud Influence on ERA5 and AMPS Surface Downwelling Longwave Radiation Biases in West Antarctica

Journal Article · · Journal of Climate
 [1];  [1];  [2];  [2];  [3];  [4];  [5];  [6]
  1. Pennsylvania State Univ., University Park, PA (United States)
  2. The Ohio State Univ., Columbus, OH (United States)
  3. NASA Goddard Inst. for Space Studies (GISS), New York, NY (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Univ. of Wisconsin, Madison, WI (United States)
  6. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

The surface downwelling longwave radiation component (LW↓) is crucial for the determination of the surface energy budget and has significant implications for the resilience of ice surfaces in the polar regions. Accurate model evaluation of this radiation component requires knowledge about the phase, vertical distribution, and associated temperature of water in the atmosphere, all of which control the LW↓ signal measured at the surface. In this study, we examine the LW↓ model errors found in the Antarctic Mesoscale Prediction System (AMPS) operational forecast model and the ERA5 model relative to observations from the ARM West Antarctic Radiation Experiment (AWARE) campaign at McMurdo Station and the West Antarctic Ice Sheet (WAIS) Divide. The errors are calculated separately for observed clear-sky conditions, ice-cloud occurrences, and liquid-bearing cloud-layer (LBCL) occurrences. The analysis results show a tendency in both models at each site to underestimate the LW↓ during clear-sky conditions, high error variability (standard deviations > 20 W m-2) during any type of cloud occurrence, and negative LW↓ biases when LBCLs are observed (bias magnitudes >15 W m-2 in tenuous LBCL cases and >43 W m-2 in optically thick/opaque LBCLs instances). We suggest that a generally dry and liquid-deficient atmosphere responsible for the identified LW↓ biases in both models is the result of excessive ice formation and growth, which could stem from the model initial and lateral boundary conditions, microphysics scheme, aerosol representation, and/or limited vertical resolution

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); National Aeronautics and Space Administration (NASA); USDOE
Grant/Contract Number:
AC02-06CH11357; SC0017981
OSTI ID:
1572106
Alternate ID(s):
OSTI ID: 1607640
Journal Information:
Journal of Climate, Vol. 32, Issue 22; ISSN 0894-8755
Publisher:
American Meteorological SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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Persistent Supercooled Drizzle at Temperatures Below −25 °C Observed at McMurdo Station, Antarctica journal October 2019

Figures / Tables (6)