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Reanalysis of Western Pacific Typhoons in 2004 with Multi-Satellite

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Reanalysis of Western Pacific Typhoons in 2004 with Multi-Satellite Meteorol Atmos Phys 97, 3–18 (2007) DOI 10.1007/s00703-006-0240-5 Printed in The Netherlands 1 International Pacific Research Center, University of Hawaii at Manoa, Honolulu, Hawaii, USA 2 Sensor Physics Branch, NOAA=NESDIS=ORA, Camps Spring, Maryland, USA 3 Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan 4 Naval Research Laboratory, Monterey, California, USA Reanalysis of western Pacific typhoons in 2004 with multi-satellite observations X. Zhang1,T.Li1,F.Weng2, C.-C. Wu3, and L. Xu4 With 8 Figures Received July 11, 2006; accepted September 11, 2006 Published online: March 14, 2007 # Springer-Verlag 2007 Summary 1. Introduction A pilot tropical cyclone reanalysis project was conducted Tropical cyclone (TC) is an extreme weather sys- to construct a reliable, high temporal and spatial resolu- tem that may cause devastating floods and con- tion tropical cyclone dataset for selected western Pacific TC typhoons in summer 2004, with the application of the latest siderable economic and human losses. While satellite observations and a 4-dimensional variational data track forecasts have improved significantly and assimilation method. Primary data used for the reanalysis steadily over the last few decades, progress in include SSM=I rain rate, GOES-retrieved upper-level wind, storm intensity forecasting has been very slow QuikSCAT surface wind, Aqua AIRS=AMSU retrieved (DeMaria, 2005). The lack of skill in the inten- temperature and moisture profiles, and JTWC best track sity forecasts may be attributed to several factors, data. A regular reanalysis procedure was established and up to 12 western Pacific typhoons have been reanalyzed. such as insufficient horizontal and vertical res- The reanalysis period covers the entire life cycle of a olution, inadequate physical parameterizations, tropical cyclone, from a few days prior to its genesis to and the absence of full coupling with the ocean its final decay stage. A preliminary analysis shows that the in the current prediction models, but most im- reanalysis product significantly improves typhoon in- portantly, the lack of knowledge about initial tensity, structure, and track, compared to the NCEP op- 3-dimensional TC structures due to insufficient erational final analysis. The validation of the TC structure against independent observations shows that the reanaly- observations over the ocean. sis reproduces well the asymmetric characteristics of TC As demonstrated by many previous studies, the rain bands and cloud bands. A further modeling experiment key factors controlling TC intensity are the inner with an initial condition from the reanalysis product reveals core dynamics and interactions with the envi- a significant improvement in typhoon intensity forecast ronmental flow. To foster the understanding of compared to a parallel experiment with an initial condition from the NCEP final analysis, which provides a further fundamental dynamics of TC and the interaction indication of quality of the tropical cyclone reanalysis. with the environmental flow, a comprehensive The reanalysis product and the raw observational data will high-resolution dataset that covers the entire TC soon be posted on the data server of the IPRC Asia-Pacific life cycle is needed. Up to now, only some coarse Data-Research Center (http:==apdrc.soest.hawaii.edu=) for datasets (e.g., NCAR=NCEP or ECMWF re- public use. analysis) were available, and their spatial and 4 X. Zhang et al temporal resolutions are far from the detail we take advantage of a variety of satellite products, require to describe and analyze the inner-core TC such as QuikSCAT measured surface winds, structure, and the interactions among symmetric GOES-8 cloud- and water-vapor-drifted upper- and asymmetric components and higher and lower level winds, and SSM=I rainfall rates. In particu- wave-number perturbations. Aircraft radar and larly, the successful lunching of the second Earth dropsondes may provide fine-scale TC motions Observing System polar orbiting platform satel- and thermodynamic patterns, but the coverage lite Aqua with its Atmospheric Infrared Sounder is limited in both time (usually every 24 hours (AIRS) and the Advanced Microwave Sounding or so) and space (usually a few legs at one or two Unit (AMSU), in May 2002, provide us an un- special levels). precedented opportunity to obtain fine-resolution Efforts have been made to improve TC struc- (about 5 km) 3D atmospheric moisture and tem- tures using satellite products. For example, studies perature fields with continuous coverage in time. showed that the assimilation of multi-satellite These sensors constitute an innovative atmo- remote-sensing data, such as surface vector winds spheric sounding group of visible, infrared, and from scatterometer data (Leidner et al, 2003) microwave detectors, and some of them can pen- and satellite-retrieved tropospheric temperature etrate through deep convective clouds and pro- profiles from the microwave data (Chen et al, vide high-resolution multi-channel radiance and 2004), has a positive impact on TC track and moisture data. They provide new and improved intensity simulation=forecast through improved temperature measurements with an accuracy of model initial conditions. Zhang et al (2006) as- 1 K in layers of 1 km and humidity measurements similated QuikSCAT surface wind data, GOES- with an accuracy of 20% in layers of 2 km in the retrieved wind, and Aqua MODIS sounding data troposphere. Since there are limited conventional to investigate hurricane Lili (2002)’s rapid weak- observations over the open ocean where TCs oc- ening. Their study suggested that assimilating cur and evolve, an effective use of remote-sensing QuikSCAT data and GOES-derived upper-level data from satellite is crucial for improving TC winds improves the analyzed outer-core winds initialization and prediction. In this study, we and the inner-core low-level temperature and intend to utilize the aforementioned satellite pro- moisture fields significantly, while assimilating ducts and a 4DVAR data assimilation approach to Aqua MODIS sounding data improves the outer- construct a continuous-coverage, high-resolution core thermodynamic features and shows an im- TC dataset. pact on the model intensity prediction. Zhao et al Because our computer and data resources are (2005) showed the effect of a 4-dimensional limited, we selected 12 typhoons that occurred variational (4DVAR) data assimilation scheme in over the western Pacific region from May to assimilating irregularly distributed (in both space October 2004 for this reanalysis (see Table 1). and time) observations such as AMSU-A retrieved The primary data input into the data assimilation temperature and wind fields, as well as the mini- system includes time series of MSLP information mal sea-level pressure (MSLP) information. With from the best track, Aqua-measured moisture and a 72-hour simulation of a landfall typhoon, they temperature profiles, QuikSCAT surface wind concluded that both the satellite data and the fields, GOES-retrieved cloud-drifted winds, and MSLP information could improve the typhoon SSM=I rainfall rates. Our strategy is to combine track forecast, especially for the recurving of these observations with model dynamics in order the track and landing point. to derive dynamically balanced TC wind, pres- While the satellite applications above were sure, moisture, and temperature fields during the mainly for TC case studies, there is a need to entire TC life cycle. develop a general strategy to best utilize the The paper is organized as follows. In Sect. 2, remote-sensing products and advanced data as- we introduce the mesoscale model employed and similation schemes. Motivated by this emerging its adjoint model, variational data assimilation for- need, we conducted a pilot project to construct a malism, and the model configuration. The usage comprehensive, high-resolution reanalysis data- of the satellite and other observational data, set for summer 2004 western Pacific typhoons as well as the justification of their usefulness (hereafter, referred to as TC-RA). We intended to in TC initialization, are summarized in Sect. 3. Reanalysis of western Pacific typhoons 5 Table 1. List of 12 typhoons selected in the TC-RA (from can effectively shift the location of the vortex JTWC) given limited observations (Leidner et al, 2003; TC Name Period Max sfc MSLP Chen and Snyder, 2006). wind (m=s) (hPa) WP 7 Conson 04 Jun–11 Jun 42.5 958 2.1 The mesoscale model WP 9 Diamu 13 Jun–21 Jun 75 885 WP10 Mindulle 22 Jun–04 Jul 62.5 916 The Penn State University=National Center for WP12 Kompasu 13 Jul–16 Jul 22.5 991 Atmospheric Research (PSU=NCAR) mesoscale WP16 Rananim 07 Aug–12 Aug 45 954 forecast model (MM5) was used in this research. WP18 Megi 13 Aug–19 Aug 32.5 976 The MM5 is a limited-area, non-hydrostatic mod- WP19 Chaba 18 Aug–31 Aug 77.5 879 el with multiple options for various physical WP20 Aere 19 Aug–26 Aug 32.5 976 WP22 Songda 27 Aug–07 Sep 65 910 parameterization schemes (Dudhia, 1993; Grell WP25 Meari 20 Sep–29 Sep 60 922 et al, 1995). The model employs a terrain-follow- WP26 Ma-on 04 Oct–09 Oct 70 898 ing vertical coordinate, where is defined as WP27 Tokage 12 Oct–20 Oct 60 922 ¼ (p À ptop)=(psfc À ptop), p is pressure, and psfc and ptop are the pressure at the surface and model top, respectively. The model consisted of 30 ver- The demonstration of the performance of the re- tical levels from surface to 100 hPa, the 29 half- analysis product is discussed in Sect. 4. A con- levels are 0.025, 0.075, 0.125, 0.175, 0.225, clusion and discussions are given in Sect. 5. 0.275, 0.325, 0.375, 0.425, 0.525, 0.575, 0.625, 0.660, 0.685, 0.715, 0.740, 0.760, 0.785, 0.815, 0.840, 0.860, 0.885, 0.910, 0.930, 0.950, 0.965, 2.
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