Evaluation of the AMPS Boundary Layer Simulations on the Ross Ice Shelf with Tower Observations
Evaluation of the AMPS Boundary Layer Simulations on the Ross Ice Shelf with Tower Observations
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罗斯冰架 AMPS 边界层模拟与塔观测评估
DOI:
10.1175/jamc-d-16-0032.1
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发表时间:
2016
影响因子:
3
通讯作者:
Wang, Sheng-Hung
中科院分区:
文献类型:
--
作者:
Wille, Jonathan D.;Bromwich, David H.;Nigro, Melissa A.;Cassano, John J.;Mateling, Marian;Lazzara, Matthew A.;Wang, Sheng-Hung
Flight operations in Antarctica rely on accurate weather forecasts aided by the numerical predictions primarily produced by the Antarctic Mesoscale Prediction System (AMPS) that employs the polar version of the Weather Research and Forecasting (Polar WRF) Model. To improve the performance of the model’s Mellor–Yamada–Janjić (MYJ) planetary boundary layer (PBL) scheme, this study examines 1.5 yr of meteorological data provided by the 30-m Alexander Tall Tower! (ATT) automatic weather station on the western Ross Ice Shelf from March 2011 to July 2012. Processed ATT observations at 10-min intervals from the multiple observational levels are compared with the 5-km-resolution AMPS forecasts run daily at 0000 and 1200 UTC. The ATT comparison shows that AMPS has fundamental issues with moisture and handling stability as a function of wind speed. AMPS has a 10-percentage-point (i.e., RH unit) relative humidity dry bias year-round that is highest when katabatic winds from the Byrd and Mulock Glaciers exceed 15 m s−1. This is likely due to nonlocal effects such as errors in the moisture content of the katabatic flow and AMPS not parameterizing the sublimation from blowing snow. AMPS consistently overestimates the wind speed at the ATT by 1–2 m s−1, in agreement with previous studies that attribute the high wind speed bias to the MYJ scheme. This leads to reduced stability in the simulated PBL, thus affecting the model’s ability to properly simulate the transfer of heat and momentum throughout the PBL.
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影响因子:
3.2
作者:
Nigro, Melissa A.;Cassano, John J.
通讯作者:
Cassano, John J.
DOI:
--
发表时间:
1993
期刊:
影响因子:
--
作者:
Zhongze Liu;D. Bromwich
通讯作者:
D. Bromwich
DOI:
--
发表时间:
1987
期刊:
影响因子:
--
作者:
T. Parish;K. Waight
通讯作者:
K. Waight
DOI:
10.1002/jgrd.50128
发表时间:
2013
期刊:
Journal of Geophysical Research: Atmospheres
影响因子:
--
作者:
C. Genthon;D. Six;H. Gallee;P. Grigioni;A. Pellegrini
通讯作者:
A. Pellegrini
影响因子:
2.9
作者:
R. Fogt;D. Bromwich
通讯作者:
D. Bromwich