本研究之最主要的目標是以分析總可降水量 (total precipitable water, TPW) 、海氣參數及降雨量的變化情形建立一個適用於台灣地區的乾旱分析方法，以期尋找出可能的乾旱預警指標。並針對全球、區域及單站等不同尺度來看台灣旱象降水與海氣參數的特徵。以全球尺度而言，NOAA系列衛星求得全球緯向0-30度總可降水量平均；區域尺度而言，DMSP衛星選取北緯0至40度，東經100-140度作區域性的範圍平均；單站而言，分別以板橋及花蓮探空測站為例。結果顯示：2002、2003年的總可降水量，不論其單月平均或是年平均可降水量，均較於近十二年來之長期平均值有明顯減少的現象，而在海氣參數的部分較近八年平均值，海溫在2002年底都是偏低，而2003年底偏低的情況略少，此外潛熱通量在2003年底時並無偏低的情況，而這也是說明了在2004年初的春雨並無大幅減少的可能原因。經由海氣參數與地面雨量站作相關性分析後以A區(北台灣海峽)為建置乾旱指標的研究地區，而指標的結果與下ㄧ季全台平均雨量在定性上約有70％的準確性，而在定量上的相關性約0.5。此外若以年底末季所合成的乾旱指標預報隔年的年平均雨量，在定性上預報準確性約有85％，在定量上相關性約有0.8。

The purpose of the research is to analyze the total precipitable water (TPW), rainfalls, and the sea-atmosphere parameters variations around Taiwan area, and to make a drought index for predicting the drought occurrence in Taiwan area.
First, the zonal mean TPW of 0o to 30oE from NOAA satellites were analyzed to understand the global scale TPW variation, and TPW and the sea-atmosphere parameters within the area covered 0 to 40N and 100 to 140E measured by the Defense Meteorological Satellite Program (DMSP) satellites were analyzed to see the local scale variation. Radiosonde data collected at Panchiao and Hualian stations in Taiwan were also used to compare the previous two sets of satellite observations for validation.
The result shows that TPW of 2002 and 2003 had the lowest values during the past 12 years. In addition, the latent heat flux and sea surface temperature of 2002 had the lowest values during the recent 8 years.
In the end of 2003, the result also shows that the latent heat flux was normal and the sea surface temperature slightly below normal. That is the reason why the spring rain still maintain normal in the early months of 2004. By the correlation analyzing, the North Taiwan Strait test area was pickup, and the sea-atmospheric parameters in this area were used to make a drought index for the whole Taiwan area. The test result shows that the drought index made in this study could work well.

1.汪中和，2004:臺灣降雨的長期變化及對環境的衝擊， 自然與文化研討會，農委會林試所，3，30-38.
[http://www.earth.sinica.edu.tw/~chwang/publications.html]
2.劉振榮，高而正，林唐煌，1996:地面微波遙測資料在
大氣水氣含量估算上之研究。大氣科學，Vol.24, No.3, 165-188。
3.劉崇治與劉振榮，2000：應用衛星資料在梅雨季海上中尺度對流系統生成前兆之初步探討。大氣科學，
Vol.28，No.4,317-341。
4.陳朝圳，李錦育，2001: 以NOAA氣象衛星資料進行乾旱研究。航測及遙測學刊，Vol.2,No,7, 75-86。
5.柳中明，許晃雄，童慶斌，陳明業，2002:2002年台灣乾旱之省思。立法院院聞月刊，Vol.30, No,8,29-47。
6.Alishouse, J.C., S. Snyder, J. Vongsathorn, and
R.R. Ferraro, 1990:Determination of oceanic total precipitable water from the SSM/I. IEEE Trans. Geo. Rem. Sens., 28,811-816.
7.Bergman, K. H., P. Sabol, and D. Miskus, 1988:
Experimental indices indices for monitoring global drought conditions.Proc. 13th Annual Climate Diagnostics Workshop,Cambridge, MA, U.S.Dept. of Commerence, 190-197.
8.Bhalme, H. N., and D. A. Mooley, 1980: Large-
scale drought/floods and moonsoon circulation. Mon. Wea. Rev.,108, 1197-1211.
9.Grody, N., J. Zhao, R. Ferraro, F. Weng, and R.
Boers, 2001: Determination of precipitable water and cloud liquid water over ocean from the NOAA 15 Advanced microwave sounding unit, J. Geophys. Res. , 106, 2943-2953.
10.Gibbs,W.J., and J.V. Maher, 1967: Rainfall
Deciles as Drought Indicators.Australian Burean of Meteorology,Bull.48,37pp.
11.Hayes, M. J., cited 2000: Drought indices.
[Available online at http://enso.unl.edu/ndmc/enigma/indices.htm.]
12.-------,M. D. Svoboda, D. A. Wilhite, and O. V. Vanyranko, 1999:Monitoring the 1996 drought using the Standardized Precipitation Index.Bull. Amer. Meteor. Soc., 80, 429-438.
13.Heim, R. R., Jr., 2000:Drought indices: A review. Drought: A Global Assessment, D.A. Wilhite, Ed., Routledge, 159-167.
14.Hollinger, J., R. Lo, and G. Poe, 1987: Special Sensor Microwave/Imager User''s Guide, Naval Research Laboratory,Washington D.C.
15.-------,J. L. Perich, and G. A. Poe, 1990:
SSM/I instrument evaluation,IEEE Trans. Geosci. Remote Sensing, 28,781-790.
16.Huang, J., H. van den Dool, and K. P.
Georgakakos, 1996: Analysis of model-calculated soil moisture over the United States (1931-93) and application to long-range temperature
forecasts. J.Climate, 9, 1350-1362.
17.John Keyantash and John A. Dracup, 2002 : The
Quantification of Drought: An Evaluation of Drought Indices. Dracup,1167–1180.
18.Karl, T. R., 1986: The sensitivity of the Palmer Drought Severity Inderx and Palmer’s Z-index to the their calibration cofficients including potential evapotranspiration. J. Climate Appl. Meteor., 25,77-86.
19.Kinninmonth, W. R., M. E. Voice, G. S. Beard, G. C. de Hoedt, and C. E.Mullen, 2000:
Australian climate services for drought management.Drought: A Global Assessment,
D.A. Wilhite,Ed., Routledge, 210-222.
20.Kogan, F.N.,1997:Global Drought Watch from Space, Bulletion of the American Meteorological
Society., Vol.78, No.4, 621-635.
21.Liu, G.-R., C.-C. Liu and T.-H. Kuo, 2002: A
Satellite-derived Objective Potential Index for MCS Development during the Mei-Yu Period. Journal
of the Meteorological Society of Japan,Vol. 80, No. 3, pp. 503-517.
22.McKee, T. B., N.J. Doesken, and J.Kleist,
1993:Drought monitoring with multiple
timescales. Preprints, Eighth Conf. on Applied Climatology, Anaherim,CA, Amer. Meteor.Soc., 179-184.
23.Palmer, W. C., 1965: Meteorological Drought.
Wather Bureau, Research Paper No.45, U.S. Dept. of Commerce, Washington,DC, 588 pp.
24.--------,1968: Keeping track of crop moisture
conditions, nationwide: The new Crop Moisture Index. Weatherwise,21, 156-161.
25.Petty, G.W., 1994: Physical retrievals of over-
ocean rain rate from multichannel microwave imagery. Part II: Algorithm implementation.
Meteorol. Atmos. Phys., 54, 101-122
26.Rasmussen, E.M., R. E. Dickinson, J. E. Kutzbach,and M. K. Cleaveland, 1993:
Climatology. Handbook of Hydrology, D. R.
Maidment, Ed., McGraw-Hill, 2.1-2.44.
27.Shafer, B.A., and L. E., Dezman, 1982:
Development of a Surface Water Supply Index (SWSI) to assess the severity of drought conditions in snowpack runoff areas. Proc.50th Westertn Snow Conf.,Reno, NV, 164-175.
28.Sobrino, J.A., J.C. Jimenez, N. Raissouni, and G. Soria, 2002:A Simplified Method for Estimating the Total Water Vapor Content Over Sea Surfaces Using NOAA-AVHRR Channels 4 and 5, IEEE Trans.
Geo. Rem.Sens., 40, 357-361.
29.Tokumaru K. and F. Kogan, 1993. Satellite
technology for environmental monitoring in developing countries.United Nations Educational,
Scientific and Cultural Organization, Paris (France). Div. of Earth Sciences.4p.
30.van Rooy, M. P., 1965: A rainfall anomaly index independent of time and space.Notos, 14, 46-48.
31.Wihite, D. A., 2000: Drought as a natureal
hazard: Concepts and definitions.Drought: A Global Assessment, D. A. Wihite, Ed. Routledge, 3-18.
32.--------, and M. H. Glantz, 1985:Understanding
the drought phenomenon: The role of definitions. Water Int., 10, 111-120.
33.WMO,1975: Drought and Agriculture. WMO Tech. Note 138, 127 pp.
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