Multivariate Objective Analysis of Wind and Height Fields in the Tropics

S.K. Sinha; S. Rajamani

doi:10.1007/BF02656836

Impact Factor: 5.8

Volume 12 Issue 2

Apr. 1995

Article Contents

Article > ADVANCES IN ATMOSPHERIC SCIENCES > 1995 > 12(2): 233-244

Multivariate Objective Analysis of Wind and Height Fields in the Tropics

1.
Indian Institute of Tropical Meteorology, Dr. Homi Bhabha Marg, Pashan, Pune-411008, India,Indian Institute of Tropical Meteorology, Dr. Homi Bhabha Marg, Pashan, Pune-411008, India

doi: 10.1007/BF02656836

Abstract
References
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Abstract:
The commonly used objective analysis scheme (Scheme-A) for the analysis of wind and geopotential height smoothen the divergent component of the wind which is rather important in the tropics, specifically over convective regions. To overcome this deficiency, a new analysis scheme in which divergent component is included in the statisti-cal model of the wind forecast errors, has been proposed by Daley (1985). Following this scheme, a new set of correla-tion functions of forecast errors for the Indian region during monsoon season which are suitable for analysing the tropical wind are obtained. This analysis scheme (Scheme-B) as well as Scheme-A were used to make analyses for the period from 4 July to 8 July 1979 (12 GMT) at 850, 700 and 200 hPa levels over an area bounded by 1.875oN to 39,375oN and 41.250oE to 108.750oE and subsequently divergent component, velocity potential are computed for both schemes. Results from both these schemes show that in the monsoon depression region the velocity potential and divergence have increased in the later case (Scheme-B). This suggests that the divergent component has been en-hanced in Scheme-B and that the objective of this study is realized to some extent.
- Multivariate optimum interpolation scheme,
- Divergent part of the wind,
- Tropics,
- Objective analysis
References

[1]	ZHAO Jun, SONG Junqiang, LI Zhenjun, 2003: Distributed Parallelization of a Global Atmospheric Data Objective Analysis System, ADVANCES IN ATMOSPHERIC SCIENCES, 20, 159-163. doi: 10.1007/BF03342060
[2]	S. K. Sinha, S. G. Narkhedkar, D. R. Talwalkar, S. Rajamani, 1992: Some Experiments with Multivariate Objective Analysis Scheme of Heights and Winds Using Optimum Interpolation, ADVANCES IN ATMOSPHERIC SCIENCES, 9, 431-440. doi: 10.1007/BF02677075
[3]	S.K. Sinha, D.R. Talwalkar, S.G. Narkhedkar, S. Rajamani, 1989: A Scheme for Objective Analysis of Wind Field Incorporating Multi-Weighting Functions in the Optimum Interpolation Method, ADVANCES IN ATMOSPHERIC SCIENCES, 6, 435-446. doi: 10.1007/BF03342547
[4]	C.-L. SHIE, W.-K. TAO, J. SIMPSON, 2006: A Note on the Relationship Between Temperature and Water Vapor over Oceans, Including Sea Surface Temperature Effects, ADVANCES IN ATMOSPHERIC SCIENCES, 23, 141-148. doi: 10.1007/s00376-006-0014-5
[5]	P.C.S. Devara, P. Ernest Raj, 1993: Lidar Measurements of Aerosols in the Tropical Atmosphere, ADVANCES IN ATMOSPHERIC SCIENCES, 10, 365-378. doi: 10.1007/BF02658142
[6]	S. N. Bavadekar, R. M. Khaladkar, 1994: Estimation of Winds at Different Isobaric Levels Based on the Observed Winds at 850 hPa Level Using Double Fourier Series, ADVANCES IN ATMOSPHERIC SCIENCES, 11, 327-334. doi: 10.1007/BF02658152
[7]	S. K. Sinha, D. R. Talwalkar, S. Rajamani, 1987: ON SOME ASPECTS OF OBJECTIVE ANALYSIS OF HUMI-DITY OVER INDIAN REGION BY THE OPTIMUM INTERPOLATION METHOD, ADVANCES IN ATMOSPHERIC SCIENCES, 4, 332-342. doi: 10.1007/BF02663603
[8]	P. N. Mahajan, D. R. Talwalkar, S. Nair, S. Rajamani, 1992: Construction of Vertical Wind Profile from Satellite-Derived Winds for Objective Analysis of Wind Field, ADVANCES IN ATMOSPHERIC SCIENCES, 9, 237-246. doi: 10.1007/BF02657514
[9]	Wei Ming, Dang Renqing, Ge Wenzhong, Takao Takeda, 1998: Retrieval Single-Doppler Radar Wind with Variational Assimilation Method-Part I: Objective Selection of Functional Weighting Factors, ADVANCES IN ATMOSPHERIC SCIENCES, 15, 553-568. doi: 10.1007/s00376-998-0032-6
[10]	Zhang Renhe, Zhao Gang, 2001: Meridional Wind Stress Anomalies over the Tropical Pacific and the Onset of El Ni?o Part Ⅱ: Dynamical Analysis, ADVANCES IN ATMOSPHERIC SCIENCES, 18, 1053-1065. doi: 10.1007/s00376-001-0022-4
[11]	Zhang Renhe, Zhao Gang, Tan Yanke, 2001: Meridional Wind Stress Anomalies over Tropical Pacific and the Onset of El Nino. Part Ⅰ: Data Analysis, ADVANCES IN ATMOSPHERIC SCIENCES, 18, 467-480. doi: 10.1007/s00376-001-0038-9
[12]	Song Yucheng, Huang Ronghui, 1995: The Dynamical Effects of Divergent Wind on the Intraseasonal Variability of the East Asian Circulation, ADVANCES IN ATMOSPHERIC SCIENCES, 12, 259-272. doi: 10.1007/BF02656976
[13]	S. K. Sinha, D, R. Talwalkar, S. G. Narkhedkar, P. L. Kulkarni, S. Nair, S. Rajamani, 1990: Use of Surface Observations to Estimate Upper Air Humidity for the Objective Analysis of Relative Humidity over Indian Region, ADVANCES IN ATMOSPHERIC SCIENCES, 7, 491-501. doi: 10.1007/BF03342567
[14]	FuZuntao, Zhao Qiang, QiaoFangli, Liu Shikuo, 2000: Response of Atmospheric Low-frequency Wave to Oceanic Forcing in the Tropics, ADVANCES IN ATMOSPHERIC SCIENCES, 17, 569-575. doi: 10.1007/s00376-000-0020-y
[15]	ZHANG Rong-Hua, WANG Zhanggui, 2013: Model Evidence for Interdecadal Pathway Changes in the Subtropics and Tropics of the South Pacific Ocean, ADVANCES IN ATMOSPHERIC SCIENCES, 30, 1-9. doi: 10.1007/s00376-012-2048-1
[16]	Lu Riyu, 2000: Anomalies in the Tropics Associated with the Heavy Rainfall in East Asia during the Summer of 1998, ADVANCES IN ATMOSPHERIC SCIENCES, 17, 205-220. doi: 10.1007/s00376-000-0004-y
[17]	Lu Peisheng, 1993: The Propagation of Disturbances Excited by Low-Frequency Oscillations in the Tropics, ADVANCES IN ATMOSPHERIC SCIENCES, 10, 287-295. doi: 10.1007/BF02658134
[18]	Peter J. Webster, Min Dong, 1992: The Structure of Low Frequency Phenomena in the Tropics and Its Interaction with the Extratropics, ADVANCES IN ATMOSPHERIC SCIENCES, 9, 1-16. doi: 10.1007/BF02656925
[19]	Liao Qinghai, Li Chongyin, 1995: CISK-rossby wave and the 30-60 Day Oscillation in the Tropics, ADVANCES IN ATMOSPHERIC SCIENCES, 12, 1-12. doi: 10.1007/BF02661282
[20]	Fei XIE, Yan XIA, Wuhu FENG, Yingli NIU, 2023: Increasing Surface UV Radiation in the Tropics and Northern Mid-Latitudes due to Ozone Depletion after 2010, ADVANCES IN ATMOSPHERIC SCIENCES, 40, 1833-1843. doi: 10.1007/s00376-023-2354-9

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Manuscript History

Manuscript received: 10 April 1995

Manuscript revised: 10 April 1995

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Multivariate Objective Analysis of Wind and Height Fields in the Tropics

1. Indian Institute of Tropical Meteorology, Dr. Homi Bhabha Marg, Pashan, Pune-411008, India,Indian Institute of Tropical Meteorology, Dr. Homi Bhabha Marg, Pashan, Pune-411008, India

Manuscript received: 1995-04-10
Manuscript revised: 1995-04-10

Abstract: The commonly used objective analysis scheme (Scheme-A) for the analysis of wind and geopotential height smoothen the divergent component of the wind which is rather important in the tropics, specifically over convective regions. To overcome this deficiency, a new analysis scheme in which divergent component is included in the statisti-cal model of the wind forecast errors, has been proposed by Daley (1985). Following this scheme, a new set of correla-tion functions of forecast errors for the Indian region during monsoon season which are suitable for analysing the tropical wind are obtained. This analysis scheme (Scheme-B) as well as Scheme-A were used to make analyses for the period from 4 July to 8 July 1979 (12 GMT) at 850, 700 and 200 hPa levels over an area bounded by 1.875oN to 39,375oN and 41.250oE to 108.750oE and subsequently divergent component, velocity potential are computed for both schemes. Results from both these schemes show that in the monsoon depression region the velocity potential and divergence have increased in the later case (Scheme-B). This suggests that the divergent component has been en-hanced in Scheme-B and that the objective of this study is realized to some extent.

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