Rainfall variability in the rainy season of semiarid zone of northeast Brazil (NEB) and its relation to wind regime

International Journal of Climatology - Tập 27 Số 4 - Trang 493-512 - 2007
M. C. de Lima Moscati1, Manoel Alonso Gan1
1Instituto Nacional de Pesquisas Espaciais—INPE, Centro de Previsão de Tempo e Estudos Climáticos—CPTEC, Av. dos Astronautas, 1758, Jd Granja, São José dos Campos, SP, 12.227‐010, Brazil

Tóm tắt

AbstractThe rainfall and the 850 hPa wind characteristic of the semiarid interior zone of the northeast Brazil (NEB) are analyzed. The database used are the daily mean u, v, z, T, q and θ, at 850 hPa, 500 hPa and 200 hPa, displayed on a 2.5° × 2.5° grid, from the NCEP/NCAR reanalysis; the daily mean OLR data from the Climate Diagnostics Center, from June 1986 to December 1997; and the gridded daily precipitation (P) analysis data in Brazil (10°S–40°S and 30°W–80°W), produced by the Climate Prediction Center, from 1977 to 1997. Daily time series of the normalized rainfall index (RI) and the normalized 850 hPa wind indexes (i.e. zonal index (ZI), the meridional index (MI) and the u minus v index (UVI)) were calculated for northern (A1: 7°S–10°S and 37°W–44°W) and southern (A2: 10°S–15°S and 40°W–45°W) domains. The RI, ZI, MI and UVI were defined by area‐average of P, u, v, and u minus v, divided by the number of grid points corresponding to each area, respectively. As for regional features this region presents a well‐defined annual cycle of rainfall with rainy seasons from December to April in A1 and from November to March in A2, and a few extreme rainfall events (during a 20‐year period, 26 cases occurred in A1 and 39 cases in A2). Several synoptic scale systems acting alone or simultaneously in the NEB could explain the occurrence of heavy rainfall in this region. The RI is correlated positively with both the ZI and the UVI, and negatively with the MI, which might indicate that when easterly and southerly winds intensify (weaken), the rainfall decreases (increases). From the statistical perspective the UVI appears to be more effective to describe the daily rainfall variability in the NEB semiarid interior region, compared to the ZI or MI. Copyright © 2006 Royal Meteorological Society.

Từ khóa


Tài liệu tham khảo

Alves JMB, 1992, The rainfall variability over Northeast Brazil region and El Niño/southern oscillation (ENSO) events (in portuguese), Revista Brasileira de Meteorologia, 7, 583

Bulletin “Climanálise”.1986 1987 1988 1989 1990 1991 1992 1993 1994 1995. São José dos CamposINPEv.1–12.

Bulletin “Climanálise”.1996 1997. v. 1–12. (http://www.cptec.inpe.br).

10.1007/s00704-003-0020-9

CharbaPJ HarrellAWIII LacknerAC.1992.A Monthly Precipitation Amount Climatology Derived From Published Atlas Maps: Development Of A Digital Database.NOAA TDL Office Note 92‐7 20p.

10.1175/1520-0493(2001)129<2614:ACFAWR>2.0.CO;2

10.1175/1520-0493(1983)111<1655:DSORAI>2.0.CO;2

10.1002/joc.3370020104

10.1175/1520-0493(1959)087<0367:AOOAS>2.0.CO;2

Gan MA, 2003, 2001/02 rainfall season over Central‐West Brazil region (in portuguese), Revista Brasileira de Meteorologia, 18, 183

10.1175/1520-0442(2004)017<0047:TSAMCA>2.0.CO;2

GlahnHR ChambersTL RichardsonWS PerrottiHP.1985.Objective map analysis for the local AFOS MOS Program.NOAA Tech. Memo. NWS TDL 75 34pp.

10.1017/S1350482703001117

10.1002/qj.49710343505

10.1175/1520-0442(2000)013<0793:EPEITW>2.0.CO;2

10.1175/1520-0442(2000)013<3576:OOEPEI>2.0.CO;2

10.1175/1520-0442(2002)015<0905:AABPIT>2.0.CO;2

10.1175/1520-0477(1996)077<0437:TNYRP>2.0.CO;2

Klein AMG, 2003, Trends in indices of daily temperature and precipitation extremes in Europe, 1946‐99, Journal of Climate, 16, 3665, 10.1175/1520-0442(2003)016<3665:TIIODT>2.0.CO;2

10.1175/1520-0493(1979)107<1140:FIONB>2.0.CO;2

10.1175/1520-0493(1985)113<1951:ACCAWR>2.0.CO;2

10.2151/jmsj1965.56.5_457

10.1175/2772.1

MagalhãesAR FilhoHC GaragorryFL GasquesJG MolionLCB NetoM da SA NobreCA PortoER RebouçasOE.1987. The climatology of droughts and droughts prediction. In:The Effects of Climatic Variations on Agriculture in Northeast Brazil. Chapter 2 p29–48.

MoscatiMCL GanMA.2002.Synoptic features of the atmospheric circulation over Northeast Brazil during dry and wet periods occurred in the summer 2001/2002 (in portuguese). In: XII Congresso Brasileiro de Meteorologia.Anais. CDROM (SP2_46‐2436‐1).

MoscatiMCL GanMA.2004.One case of Extreme Heavy Rainfall Occurred in the Semiarid Interior Zone of Northeast Brazil (NEB) (in Portuguese). In: XII Congresso Brasileiro de Meteorologia.Anais. CDROM (CPC6‐0376).

NOAA/WMO.Monthly Climatic Data for the World. Prepared in cooperation with the World Meteorological Organization (WMO). (ISSN 0027–0296).

OliveiraAS.1986.Interactions between the South American frontal systems and the Amazonian Convection (in Portuguese). M. S. Thesis Dept. of Meteorology 115 pp. [Available in the library of the Instituto Nacional de Pesquisas Espaciais 12.201–970 São José dos Campos SP Brazil—Tech. Rep. INPE‐4008‐TDL/239].

10.1175/1520-0493(2002)130<3054:COWADS>2.0.CO;2

10.1029/JC080i012p01665

10.1175/1520-0442(1993)006<1754:SAIVOR>2.0.CO;2

RaoVB LimaMC FranchitoSH.1992.On the Role of the Coastal Wind in the Interannual Variations of Rainfall over Eastern Northeast Brazil.TOGA Notes p12–16.

Ratisbona CR, 1976, Climates of Central and South America, 219

10.1007/s00704-003-0728-6

10.1111/j.1600-0870.1987.tb00288.x

StrangDMGD.1972.Climatological Analysis of Rainfall Normals in Northeast Brazil.29p. [Available from Centro Técnico Aeroespacial (CTA) 12 201‐970 São José dos Campos SP Brazil—Paper No. IAE‐M‐02/72].

10.1175/1520-0477(1999)080<0629:COSASM>2.0.CO;2

10.1175/1520-0442(2002)015<1591:CEFASC>2.0.CO;2

10.1175/1520-0442(2002)015<3206:OOTSMO>2.0.CO;2

Thông tin
Thông tin xuất bản

International Journal of Climatology

Tập 27 Số 4

493-512

Thông tin tác giả