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Titolo:
Can surface pressure be used to remove atmospheric contributions from GRACE data with sufficient accuracy to recover hydrological signals?
Autore:
Velicogna, I; Wahr, J; Van den Dool, H;
Indirizzi:
Univ Colorado, Dept Phys, Boulder, CO 80309 USA Univ Colorado Boulder CO USA 80309 rado, Dept Phys, Boulder, CO 80309 USA Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA Univ Colorado Boulder CO USA 80309 es Environm Sci, Boulder, CO 80309 USA Natl Ctr Environm Predict, Climate Predict Ctr, Washington, DC 20233 USA Natl Ctr Environm Predict Washington DC USA 20233 ashington, DC 20233 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
fascicolo: B8, volume: 106, anno: 2001,
pagine: 16415 - 16434
SICI:
0148-0227(20010810)106:B8<16415:CSPBUT>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
GLOBAL POSITIONING SYSTEM; GRAVITATIONAL-FIELD; EARTHS ROTATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Velicogna, I Univ Colorado, Dept Phys, Campus Box 390, Boulder, CO 80309 USA Univ Colorado Campus Box 390 Boulder CO USA 80309 O 80309 USA
Citazione:
I. Velicogna et al., "Can surface pressure be used to remove atmospheric contributions from GRACE data with sufficient accuracy to recover hydrological signals?", J GEO R-SOL, 106(B8), 2001, pp. 16415-16434

Abstract

The Gravity Recovery and Climate Experiment (GRACE) satellite mission willresolve temporal variations in gravity orders of magnitude more accuratelyand with considerably higher resolution than any existing satellite. Effects of atmospheric mass over land will be removed prior to estimating the gravitational field, using surface pressure fields generated by global weather forecast centers. To recover the continental hydrological signal with ailaccuracy of 1 cin of equivalent water thickness down to scales of a few hundred kilometers, atmospheric pressure must be known to an accuracy of I mbar or better. We estimate errors in analyzed pressure fields and the impactof those errors on GRACE surface mass estimates by comparing analyzed fields with barometric surface pressure measurements in the United States and North Africa/Arabian peninsula. We consider (1) the error in 30-day averagesof the pressure field, significant because the final GRACE product will average measurements collected over 30-day intervals, and (2) the short-period error in the pressure fields which would be aliased by GRACE orbital passes. Because the GRACE results will average surface mass over scales of several hundred kilometers, we assess the pressure field accuracy averaged overthose same spatial scales. The atmospheric error over the 30-day averagingperiod, which will map directly into GRACE data, is generally <0.5 mbar. Consequently, analyzed pressure fields will be adequate to remove the atmospheric contribution from GRACE hydrological estimates to subcentimeter levels. However, the short-period error in the pressure field, which would aliasinto GRACE data, could potentially contribute errors equivalent to 1 cm ofwater thickness. We also show that given sufficiently dense barometric coverage, an adequate surface pressure field can be constructed from surface pressure measurements alone.

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Documento generato il 04/07/20 alle ore 18:15:54