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Record #165474:

Factors controlling the near-surface wind field in Antarctica / M.R. van den Broeke, N.P.M. van Lipzig.

Title: Factors controlling the near-surface wind field in Antarctica / M.R. van den Broeke, N.P.M. van Lipzig.
Author(s): Broeke, M. R. van den.
Lipzig, N. P. M. van.
Date: 2003.
Abstract: Presents momentum budget of Antarctic atmospheric surface layer (SL) using data from regional atmospheric climate model RACMO/ANT1. Katabatic pressure gradient force (PGF) dominates SL momentum budget over steep coastal slopes in winter, resulting in strong and directionally constant katabatic winds, but where surface slopes are gentler further inland, large-scale PGF may be equally important. With circumpolar pressure trough north of Antarctic coastline, large-scale PGF acts along with katabatic PGF in downslope direction, and in Wilkes Land, Dronning Maud Land and on western Ross Ice Shelf, large-scale PGF causes equivalent geostrophic winds in excess of 10 m s⁻¹. Thermal wind effects opposing downslope acceleration are especially strong in areas where large-scale forcing is weak, allowing cold air to pile up over flat ice shelves and sea ice-covered ocean. In austral summer when absorption of shortwave radiation at surface strongly reduces katabatic forcing and thermal wind effects, and large-scale PGF dominates SL momentum budget, large-scale easterly winds in some regions are stronger than in winter. In contrast, SL winds in coastal West Antarctica and Antarctic Peninsula are very variable on seasonal timescale.
Notes:

Offprint: Monthly Weather Review. Vol. 131(4) :733-743.

Keywords: 551.5 -- Meteorology.
551.55 -- Wind and air turbulence.
551.555.4 -- Katabatic winds, cold.
551.54 -- Atmospheric pressure.
551.4 -- Geomorphology.
551.4.037 -- Slopes.
519.673 -- Modelling.
001.89(100) -- Research programmes, international.
001.89 -- Research programmes: European Project for Ice Coring in Antarctica (EPICA).
D -- Atmospheric sciences.
(*7) -- Antarctic regions.
Location(s): SCO: SPRI-PAM: (*7) : 551.55
SPRI record no.: 165474

MARCXML

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005 20221007115348.0
007 ta
008 221007s2003####xx#ab#|##|###|0||#0|eng#d
035 ## ‡aSPRI-165474
040 ## ‡aUkCU-P‡beng‡eaacr
100 1# ‡aBroeke, M. R. van den.
245 10 ‡aFactors controlling the near-surface wind field in Antarctica /‡cM.R. van den Broeke, N.P.M. van Lipzig.
260 ## ‡a[S.l.] :‡b[s.n.],‡c2003.
300 ## ‡ap. 733-743 :‡bdiags., maps.
500 ## ‡aOffprint: Monthly Weather Review. Vol. 131(4) :733-743.
520 3# ‡aPresents momentum budget of Antarctic atmospheric surface layer (SL) using data from regional atmospheric climate model RACMO/ANT1. Katabatic pressure gradient force (PGF) dominates SL momentum budget over steep coastal slopes in winter, resulting in strong and directionally constant katabatic winds, but where surface slopes are gentler further inland, large-scale PGF may be equally important. With circumpolar pressure trough north of Antarctic coastline, large-scale PGF acts along with katabatic PGF in downslope direction, and in Wilkes Land, Dronning Maud Land and on western Ross Ice Shelf, large-scale PGF causes equivalent geostrophic winds in excess of 10 m s⁻¹. Thermal wind effects opposing downslope acceleration are especially strong in areas where large-scale forcing is weak, allowing cold air to pile up over flat ice shelves and sea ice-covered ocean. In austral summer when absorption of shortwave radiation at surface strongly reduces katabatic forcing and thermal wind effects, and large-scale PGF dominates SL momentum budget, large-scale easterly winds in some regions are stronger than in winter. In contrast, SL winds in coastal West Antarctica and Antarctic Peninsula are very variable on seasonal timescale.
541 0# ‡aBroeke, M.R. van der (gift)‡5UkCU-P
650 07 ‡a551.5 -- Meteorology.‡2udc
650 07 ‡a551.55 -- Wind and air turbulence.‡2udc
650 07 ‡a551.555.4 -- Katabatic winds, cold.‡2udc
650 07 ‡a551.54 -- Atmospheric pressure.‡2udc
650 07 ‡a551.4 -- Geomorphology.‡2udc
650 07 ‡a551.4.037 -- Slopes.‡2udc
650 07 ‡a519.673 -- Modelling.‡2udc
650 07 ‡a001.89(100) -- Research programmes, international.‡2udc
650 07 ‡a001.89 -- Research programmes: European Project for Ice Coring in Antarctica (EPICA).‡2udc
650 07 ‡aD -- Atmospheric sciences.‡2local
651 #7 ‡a(*7) -- Antarctic regions.‡2udc
700 1# ‡aLipzig, N. P. M. van.
852 7# ‡2camdept‡bSCO‡cSPRI-PAM‡h(*7) : 551.55‡9Create 1 item record‡0Migrate
916 ## ‡a129118 -- 2003/08/11 -- HS
917 ## ‡aUnenhanced record from Muscat, imported 2019
948 3# ‡a20221007 ‡bHS