ASAR and ASCAT in Polar Low SituationsSource: Journal of Atmospheric and Oceanic Technology:;2015:;volume( 032 ):;issue: 004::page 783Author:Furevik, Birgitte Rugaard
,
Schyberg, Harald
,
Noer, Gunnar
,
Tveter, Frank
,
Röhrs, Johannes
DOI: 10.1175/JTECH-D-14-00154.1Publisher: American Meteorological Society
Abstract: orecasting and monitoring polar lows are, to a large degree, based on satellite observations from passive radiometers and from scatterometer winds in addition to synoptic observations and numerical models. Synthetic aperture radar (SAR) brings higher resolution compared to other remotely sensed sources of ocean wind, such as scatterometer data and passive microwave wind products. The added information in polar low situations from SAR and the increased-resolution scatterometer wind fields are investigated. Statistically, higher variability in the MetOp Advanced Scatterometer (ASCAT) wind is clearly found during polar low situations compared to all situations. Slightly more variability is also seen in the ASCAT 12.5-km wind product compared to the operational European Centre for Medium-Range Weather Forecasts (ECMWF) model surface winds. In two analyzed polar low cases, Environmental Satellite (Envisat) Advanced SAR (ASAR) images reveal numerous interesting features, such as the sharp fronts and the location and strength of the strongest wind field in the polar low. It is likely that if SAR images are available to operational weather forecasting, that it can in some cases lead to earlier detection of polar lows. However, a reliable wind field from SAR is still needed.
|
Collections
Show full item record
contributor author | Furevik, Birgitte Rugaard | |
contributor author | Schyberg, Harald | |
contributor author | Noer, Gunnar | |
contributor author | Tveter, Frank | |
contributor author | Röhrs, Johannes | |
date accessioned | 2017-06-09T17:25:59Z | |
date available | 2017-06-09T17:25:59Z | |
date copyright | 2015/04/01 | |
date issued | 2015 | |
identifier issn | 0739-0572 | |
identifier other | ams-85159.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4228575 | |
description abstract | orecasting and monitoring polar lows are, to a large degree, based on satellite observations from passive radiometers and from scatterometer winds in addition to synoptic observations and numerical models. Synthetic aperture radar (SAR) brings higher resolution compared to other remotely sensed sources of ocean wind, such as scatterometer data and passive microwave wind products. The added information in polar low situations from SAR and the increased-resolution scatterometer wind fields are investigated. Statistically, higher variability in the MetOp Advanced Scatterometer (ASCAT) wind is clearly found during polar low situations compared to all situations. Slightly more variability is also seen in the ASCAT 12.5-km wind product compared to the operational European Centre for Medium-Range Weather Forecasts (ECMWF) model surface winds. In two analyzed polar low cases, Environmental Satellite (Envisat) Advanced SAR (ASAR) images reveal numerous interesting features, such as the sharp fronts and the location and strength of the strongest wind field in the polar low. It is likely that if SAR images are available to operational weather forecasting, that it can in some cases lead to earlier detection of polar lows. However, a reliable wind field from SAR is still needed. | |
publisher | American Meteorological Society | |
title | ASAR and ASCAT in Polar Low Situations | |
type | Journal Paper | |
journal volume | 32 | |
journal issue | 4 | |
journal title | Journal of Atmospheric and Oceanic Technology | |
identifier doi | 10.1175/JTECH-D-14-00154.1 | |
journal fristpage | 783 | |
journal lastpage | 792 | |
tree | Journal of Atmospheric and Oceanic Technology:;2015:;volume( 032 ):;issue: 004 | |
contenttype | Fulltext |