Variational retrieval of Eastern Pacific atmospheric boundary layer parameters using ATOVS with the COAMPSi mesoscale forecast system
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Authors
Cooper, Grant A., IV
Subjects
Variational Satellite Retrieval
1DVAR
COAMPS
NAVDAS
ATOVS
HIRS/3
AMSU-A
AMSU-B
DYCOMS II
Information Content
Non-linear Optimal Estimation Theory
Mesoscale Satellite Data Assimilation
Marine Atmospheric Boundary Layer
MABL
1DVAR
COAMPS
NAVDAS
ATOVS
HIRS/3
AMSU-A
AMSU-B
DYCOMS II
Information Content
Non-linear Optimal Estimation Theory
Mesoscale Satellite Data Assimilation
Marine Atmospheric Boundary Layer
MABL
Advisors
Durkee, Philip A.
Baker, Nancy L.
Date of Issue
2002-09
Date
September 2002
Publisher
Monterey, California.: Naval Postgraduate School, 2002.
Language
Abstract
A one-dimensional variational (1DVAR) retrieval scheme is used to investigate the ability of the Advanced TIROS Operational Vertical Sounder (ATOVS) to contribute information to a mesoscale NWP system within the summertime Eastern Pacific (EPAC) environment. This system is the Coupled Ocean - Atmosphere Mesoscale Prediction System (COAMPSb9s) and the Naval Research Laboratory (NRL) Atmospheric Variational Data Assimilation System (NAVDAS). Analyses of information content and retrieval performance show that, when treated optimally, significant humidity and temperature information can be derived from ATOVS retrievals within the clear and cloudy sky summertime EPAC environment. A study of retrieval error sensitivity to representative background state vector elements and associated errors was also conducted to establish the a priori elements critical for successful 1DVAR retrievals. 1DVAR profile temperature and humidity retrievals were generated using both simulated and actual ATOVS observations constrained by the COAMPS short-term forecasts and a synoptically relevant background error covariance matrix. The time period of interest coincides with the DYCOMS Phase II field study. The 1DVAR retrieval results indicate that ATOVS observations can provide information that, when used in concert with a COAMPS background field, reduce the retrieval error and adjust the retrieval within the shallow boundary layer toward the designated "true" profile. The generally good agreement between theoretical retrieval errorrs and the error statistics calculated using non-linear Newtonian iteration demonstrates the consistency and reliability of the NRL IDVAR retrieval scheme.
Type
Thesis
Description
Series/Report No
Department
Meteorology
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Format
xxvi, 244 p. : ill. (some col.) ; 28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.