A COMPARISON OF REANALYSIS DATA BETWEEN GAME AND NCEP/NCAP DURING THE PERIOD OF HUBEX

Han Rong qing; Li Weijing; Hu Guoquan; He Jinhai

Vol.15, NO.2, 2004

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2004 > 15(2): 141-151

Han Rong qing, Li Weijing, Hu Guoquan, et al. A comparison of reanalysis data between GAME and NCEP/NCAR during the period of HUBEX. J Appl Meteor Sci, 2004, 15(2): 141-151.

Citation:

Han Rong qing, Li Weijing, Hu Guoquan, et al. A comparison of reanalysis data between GAME and NCEP/NCAR during the period of HUBEX. J Appl Meteor Sci, 2004, 15(2): 141-151.

Han Rong qing, Li Weijing, Hu Guoquan, et al. A comparison of reanalysis data between GAME and NCEP/NCAR during the period of HUBEX. J Appl Meteor Sci, 2004, 15(2): 141-151.

Citation:

Han Rong qing, Li Weijing, Hu Guoquan, et al. A comparison of reanalysis data between GAME and NCEP/NCAR during the period of HUBEX. J Appl Meteor Sci, 2004, 15(2): 141-151.

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A COMPARISON OF REANALYSIS DATA BETWEEN GAME AND NCEP/NCAP DURING THE PERIOD OF HUBEX

1.
Nanjing I nstitute of Meteorology , Nanjing 210044
2.
National Climate Centre , Beijing 100081

Received Date: 2003-02-18
Rev Recd Date: 2003-04-10
Publish Date: 2004-04-30

Abstract

Abstract

A comparison of the GAME reanalysis data with the NCEP/NCAR reanalysis data is discussed, where the GAME reanalysis data includes the data observed by HUBEX. On the basis of the weather processes over the Huaihe basin from June to August in 1998, the difference and reliability of the two reanalysis data from the fields of basic element, derivative, precipitation and surface flux were studied by the diagnostic and statistical methods. The results show that the GAME reanalysis data is more reliable than NCEP/NCAP reanalysis data at the bottom and mid-high levels of troposphere, and at the precipitation and surface flux fields the case is just the same. In addition, it revealed that the GAME reanalysis data can show the evolution of the southwest vortex but the NCEP/NCAR reanalysis data cannot do so. Meanwhile, the main cause that the GAME reanalysis data is better than the NCEP/NCAR reanalysis data tends to be the GAME reanalysis data including the sonde intensive observation of the GAME but not to the different assimilation modes of the two reanalysis data. Therefore it also indicates that the HUBEX as the Eastern Asia part of the GAME is necessary to continue, and increasing the temporal and spatial resolution of meteorological elements observed is important to improve our forecasting accuracy of the weather and climate.
- HUBEX;
- Reanaly sis data;
- Comparing analysis

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References(8)

Figures and Tables

图 1 1998年夏季GAM E资料与NCEP资料的高度场对比分析

(a)为GAME和NCEP两组再分析资料850 hPa(实线)、700 hPa(长虚线)、500 hPa(空心短虚线)和100 hPa(实心短虚线)高度场相对差值的季节平均(6～8月,每日4个时次)纬向平均(100°～120°E)剖面图,(b)为两组资料的850 hPa高度场分别在00: 00(UTC,下同; 细实线)、06: 00(粗实线)、12: 00(空心短虚线)和18: 00(点虚线)4个时次的相对差值季节平均(6～8月)纬向平均(同(a))剖面图,(c和(d)分别为淮河流域入梅前后6月26日和7月2日的白昼平均OLR场(阴影区,单位: W°m^-2 与06: 00 GAME资料(实线)和NCEP资料(虚线)的高度场588 dagpm等值线

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图 2 (a)为1998年6～7月06: 00 σ坐标系中0.75层次沿30°N的GAME资料负散度与实测24 h降水量时间-经度剖面图,(b)为σ坐标系中相同情况下NCEP资料负散度与实测24 h降水量时间-经度剖面图。

(图中等值线表示负散度,单位为Pa°s^-1,阴影区为24 h降水量,单位为mm)

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图 3 1998年6月27～29日逐日06: 00 p 坐标垂直速度纬向(27.5°N)剖面图与实况24 h降水量(黑色柱体,单位为mm)

图(a)为GAME资料与实况降水,图(b)为NCEP资料与实况降水。 (黑色柱体及带下划线的数字表示27°～28°N纬带上的最大实况24 h降水量,单位为mm。等值线及其数字为p坐标垂直速度,单位: Pa°s^-1)

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图 4 1998年6～8月淮河流域16站平均降水量和GAME与NCEP资料水汽收支逐日演变(a)为淮河流域6～8月16站平均的24 h降水量演变。(b)、(c)和(d)为两组资料分别在6～8月00: 00、06: 00和18: 00淮河流域的水汽收支逐日演变

(实线为GAME资料,虚线为NCEP资料,其中纵坐标单位: 4 kg°s^-1°km^-2)

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图 5 1998年6～8月淮河地区(32.5°～35.0°N,112.5°～120.0°E)16站平均的实况24 h降水(虚线)、淮河地区平均的GAME(实线)和NCEP(点线)资料24降水逐日演变(a)及其实况降水减GAME资料降水的差值(实线)和实况降水减NCEP资料降水的差值(虚线)逐日演变(b)

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图 6 1998年6～8月06: 00 GAME资料(实线)和NCEP资料(虚线,均按小值纵坐标在淮河地区(32.5°～35.0°N,112.5～120.0°E)平均的潜热通量演变(a)和感热通量演变(b)对比分析

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表 1 淮河流域水汽收支和降水量(R)相关系数表

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