Estimation of tropical cyclone central pressure from warm core intensity observed by the Advanced Microwave Sounding Unit-A (AMSU-A)

2014 ◽  
Vol 65 (0) ◽  
pp. 35-56 ◽  
Author(s):  
Ryo Oyama
Keyword(s):  
Tropical Cyclone ◽  
Central Pressure ◽  
Warm Core ◽  
Microwave Sounding Unit ◽  
Microwave Sounding ◽  
Advanced Microwave Sounding Unit

scholarly journals Tropical Cyclone Wind Retrievals from the Advanced Microwave Sounding Unit: Application to Surface Wind Analysis

2006 ◽  
Vol 45 (3) ◽  
pp. 399-415 ◽  
Author(s):  
Kotaro Bessho ◽  
Mark DeMaria ◽  
John A. Knaff
Keyword(s):  
Tropical Cyclone ◽  
Wind Direction ◽  
Surface Wind ◽  
Wind Fields ◽  
Directional Bias ◽  
Wind Speeds ◽  
Research Division ◽  
Microwave Sounding Unit ◽  
Microwave Sounding ◽  
Advanced Microwave Sounding Unit

Abstract Horizontal winds at 850 hPa from tropical cyclones retrieved using the nonlinear balance equation, where the mass field was determined from Advanced Microwave Sounding Unit (AMSU) temperature soundings, are compared with the surface wind fields derived from NASA's Quick Scatterometer (QuikSCAT) and Hurricane Research Division H*Wind analyses. It was found that the AMSU-derived wind speeds at 850 hPa have linear relations with the surface wind speeds from QuikSCAT or H*Wind. There are also characteristic biases of wind direction between AMSU and QuikSCAT or H*Wind. Using this information to adjust the speed and correct for the directional bias, a new algorithm was developed for estimation of the tropical cyclone surface wind field from the AMSU-derived 850-hPa winds. The algorithm was evaluated in two independent cases from Hurricanes Floyd (1999) and Michelle (2001), which were observed simultaneously by AMSU, QuikSCAT, and H*Wind. In this evaluation the AMSU adjustment algorithm for wind speed worked well. Results also showed that the bias correction algorithm for wind direction has room for improvement.

scholarly journals Diagnosis of a Polar Low Warm Core Utilizing the Advanced Microwave Sounding Unit

2003 ◽  
Vol 18 (5) ◽  
pp. 700-711 ◽  
Author(s):  
Richard W. Moore ◽  
Thomas H. Vonder Haar
Keyword(s):  
Warm Core ◽  
Microwave Sounding Unit ◽  
Polar Low ◽  
Microwave Sounding ◽  
Advanced Microwave Sounding Unit

scholarly journals Warm Core Structures in Organized Cloud Clusters Developing or Not Developing into Tropical Storms Observed by the Advanced Microwave Sounding Unit

2010 ◽  
Vol 138 (7) ◽  
pp. 2624-2643 ◽  
Author(s):  
Kotaro Bessho ◽  
Tetsuo Nakazawa ◽  
Shuji Nishimura ◽  
Koji Kato
Keyword(s):  
Temperature Anomaly ◽  
Surface Wind ◽  
Tropical Storms ◽  
Temperature Profiles ◽  
Temperature Anomalies ◽  
Warm Core ◽  
Cloud Clusters ◽  
Microwave Sounding Unit ◽  
Microwave Sounding ◽  
Advanced Microwave Sounding Unit

Abstract The temperature profiles of organized cloud clusters developing or not developing (nondeveloping) into tropical storms (TSs; maximum surface wind >34 kt) over the western North Pacific in 2004 were investigated using Advanced Microwave Sounding Unit (AMSU) observations in combination with the independently created early stage Dvorak analysis. Typical temperature profiles of the developing and nondeveloping cloud clusters were compared. From this comparison, positive upper-troposphere temperature anomalies were found in both cluster types; however, the spatial extent of the temperature anomalies for the developing cloud clusters was larger than those of the nondeveloping cloud clusters. Statistical analysis was performed on the temperature anomalies near the center of all clusters retrieved from AMSU observational data. Findings indicate that the area-average temperature anomalies increased along with the intensity of the clusters indicated by the Dvorak T-number classification. Using time series analysis of upper-level temperature anomalies associated with these cloud clusters, a definition of warm core structures showing the temperature anomaly greater than a threshold (WCT) was created. WCT exists when the area averaged temperature anomaly exceeds 0.9 K. Using this definition, almost 70% of the cloud clusters that had WCTs later became TSs, while 85% of those that did not have WCTs eventually dissipated without being classified as a TS. For the WCT clusters that developed into TSs, the lead time from the detection of their AMSU-based WCT to their classification as TSs was 27.7 h. These results indicate that there is a good possibility that the detection and forecasting of tropical cyclone formation, particularly those storms that later may become classified as TSs, will be improved using temperature anomalies derived from AMSU data.

A warm core in a polar low observed with a satellite microwave sounding unit

1996 ◽  
Vol 48 (2) ◽  
pp. 193-208 ◽  
Author(s):  
JOHN M. FORSYTHE ◽  
THOMAS H. VONDER HAAR
Keyword(s):  
Warm Core ◽  
Microwave Sounding Unit ◽  
Polar Low ◽  
Microwave Sounding ◽  
Satellite Microwave
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