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Arabian Peninsula-North Pacific Oscillation and its association with the Asian summer monsoon

Science china Earth Sciences 2008年第7期51卷 1001-1012页

作者： SUN JianQi1, YUAN Wei2 & GAO YuZhong3 1 Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, china 2 china meteorological Administration Training Centre, Beijing 100081, china 3 heilongjiang meteorological observatory, harbin 150030, china 1. Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China 2. china meteorological Administration Training Centre Beijing 100081 China 3. heilongjiang meteorological observatory Harbin 150030 China

Using correlation and EOF analyses on sea level pressure from 57-year NCEP-NCAR reanalysis data, the Arabian Peninsula-North Pacific Oscillation (APNPO) is identified. The APNPO reflects the co-variability between the North Pacific high and South Asian summer monsoon low. This teleconnec- tion pattern is closely related to the Asian summer monsoon. On interannual timescale, it co-varies with both the East Asian summer monsoon (EASM) and South Asian summer monsoon (SASM); on decadal timescale, it co-varies with the EASM: both exhibit two abrupt climate changes in the middle 1960s and the late 1970s respectively. The possible physical process for the connections between the APNPO and Asian summer monsoon is then explored by analyzing the APNPO-related atmospheric circulations. The results show that with a strong APNPO, the Somali Jet, SASM flow, EASM flow, and South Asian high are all enhanced, and an anomalous anticyclone is produced at the upper level over northeast china via a zonal wave train. Meanwhile, the moisture transportation to the Asian monsoon regions is also strengthened in a strong APNPO year, leading to a strong moisture convergence over India and northern china. All these changes of circulations and moisture conditions finally result in an anoma- lous Asian summer monsoon and monsoon rainfall over India and northern china. In addition, the APNPO has a good persistence from spring to summer. The spring APNPO is also significantly corre- lated with Asian summer monsoon variability. The spring APNPO might therefore provide valuable in- formation for the prediction of Asian summer monsoon.

关键词： Arabian Peninsula-North Pacific Oscillation East Asian summer monsoon South Asian summer monsoon wave train abrupt climate change

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Forecasting the summer rainfall in North china using the year-to-year increment approach

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Science china Earth Sciences 2009年第4期52卷 532-539页

作者： FAN Ke1, LIN MeiJing1,2 & GAO YuZhong3 1 Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, china 2 Graduate University of the Chinese Academy of Sciences, Beijing 100049, china 3 heilongjiang meteorological Administration, harbin 150030, china Nansen-Zhu International Research Center Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China heilongjiang meteorological Administ

A new approach to forecasting the year-to-year increment of rainfall in North china in July-August (JA) is proposed. DY is defined as the difference of a variable between the current year and the preceding year (year-to-year increment). NR denotes the seasonal mean precipitation rate over North china in JA. After analyzing the atmospheric circulation anomalies associated with the DY of NR, five key predictors for the DY of NR have been identified. The prediction model for the DY of NR is established by using multi-linear regression method and the NR is obtained (the current forecasted DY of NR added to the preceding observed NR). The prediction model shows a high correlation coefficient (0.8) between the simulated and the observed DY of NR throughout period 1965-1999, with an average relative root mean square error of 19% for the percentage of precipitation rate anomaly over North china. The prediction model makes a hindcast for 2000-2007, with an average relative root mean square error of 21% for the percentage of precipitation rate anomaly over North china. The model reproduces the downward trend of the percentage of precipitation rate anomaly over North china during 1965-2006. Because the current operational prediction models of the summer precipitation have average forecast scores of 60%-70%, it has been more difficult to forecast the summer rainfall over North china. Thus this new approach for predicting the year-to-year increment of the summer precipitation (and hence the summer precipitation itself) has the potential to significantly improve operational forecasting skill for summer precipitation.

关键词： annual increment North china precipitation prediction prediction skill

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大、小兴安岭及邻近地区雷暴气候特征

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山地学报 2008年第4期26卷 439-444页

作者：李帅陈莉周永吉黑龙江省气象科学研究所哈尔滨市气象局黑龙江省气象信息中心

黑龙江省地处中国东部中高纬地区,大、小兴安岭林区面积占该省的50%以上,雷暴这种对流天气现象对该地区林业和社会生活都有着巨大的影响。借助黑龙江省74个地面气象站点雷暴观测资料,分析了该地区1976～2005年雷暴发生和变化情况。研究... 详细信息

黑龙江省地处中国东部中高纬地区,大、小兴安岭林区面积占该省的50%以上,雷暴这种对流天气现象对该地区林业和社会生活都有着巨大的影响。借助黑龙江省74个地面气象站点雷暴观测资料,分析了该地区1976～2005年雷暴发生和变化情况。研究得出:该地区雷暴的发生受地形的影响明显,尽管雷暴逐年发生站数总体减少趋势显著,大兴安岭部分林区却与全省大部分地区雷暴变化有反位相关系,1976年、1979年、1994年、1995年、1997年、1999～2002年、2004年这些年大兴安岭林区部分地区雷暴发生偏多,这可以部分解释林区雷击火多发的原因。另外,该地区雷暴的出现具有明显的季节性,雷暴站数年内变化呈单峰分布;而且雷暴具有热对流性和夜发性的特点;强雷暴日的发生具有连续性,在出现强雷暴日后,一定要注意随后强雷暴日发生的可能。

关键词：大、小兴安岭黑龙江省雷暴气候特征

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Application of the moist vorticity vector in the analysis of a heavy rainfall event in North china

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Progress in Natural Science:Materials International 2007年第12期17卷 1457-1465页

作者： Zhao Yu1,2,3, Wang Jianguo4 and Xue Deqiang2(1. Laboratory of Cloud-Precipitation Physics and Severe Storms, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, china 2. Shandong Provincial meteorological observatory, Jinan 250031, china 3. Graduate University of Chinese Academy of Sciences, Beijing 100039, china 4. Shandong Provincial meteorological Bureau, Jinan 250031, china) Laboratory of Cloud-Precipitation Physics and Severe Storms Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Shandong Provincial meteorological observatory Jinan 250031 China Graduate University of Chinese Academy of Sciences Beijing 100039 China Shandong Provincial meteorological Bureau Jinan 250031 China

The moist vorticity vector (MVV), defined as (ζa×▽qv)/ρ introduced by Gao et al. is used to study a heavy rainfall event in North china. The MVV has zonal, meridional and vertical components in a three-dimensional framework. Analysis of domain-mean and mass-integrated quantities shows that the variation of the vertical component of the MVV closely follows the variation of the cloud hydrometeors, with a linear correlation coefficient of 0.95, indicating that the vertical component of the MVV is strongly associated with midlatitude convection. Further analysis shows that the vertical component of the MVV reflects the interaction between the horizontal vorticity and the horizontal specific humidity gradient, which can associate dynamic and thermodynamic processes with cloud microphysical processes. Thus, this study can help to understand how the interaction between circulations and clouds aids the development of convection, and the MVV can be used to trace the development and evolution of heavy rainfall.

关键词： moist vorticity vector heavy rainfall modeling study.

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Temporal variations of δ^(18)O of atmospheric water vapor at Delingha

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Science china Earth Sciences 2008年第7期51卷 966-975页

作者： YIN ChangLiang1, YAO TanDong2, TIAN LiDe2, LIU DongNian3, YU WuSheng2 & QU DongMei2 1 State Key Laboratory of Cryoshperic Science, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, china 2 Laboratory of Environment and Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, china 3 meteorological observatory of Haixi Prefecture of Qinghai Province, Delingha 817000, china 1. State Key Laboratory of Cryoshperic Science Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China 2. Laboratory of Environment and Processes Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100085 China 3. meteorological observatory of Haixi Prefecture of Qinghai Province Delingha 817000 China

Oxygen stable isotope of atmospheric water vapor is widely used to study the modern process of cli- mate. Atmospheric water vapor samples were collected at Dlingha, northeast of Tibetan Plateau during the period from July 2005 to February 2006. The variation of δ18O and the relationships between δ18O and both the temperature and specific humidity are analyzed in this paper. Results show that the sea- sonal variation of δ18O of atmospheric water vapor at Delingha is remarkable with higher δ18O in summer and lower δ18O in winter. The temporal variation of vapor δ18O shows obvious fluctuations, with magnitude of over 37‰. The daily variation of the δ18O is highly correlated with air temperature. The relationship between δ18O and atmospheric water vapor content is complex. Study shows that δ18O of atmospheric water vapor is positively correlated with specific humidity in winter in seasonal scale and inversely correlated with specific humidity in summer rainy period. The δ18O values of at- mospheric water vapor are lower than those of precipitation at Delingha, and the average difference is 10.7‰. Variations of δ18O of atmospheric water vapor is also found to be affected by precipitation events, The model results show that the precipitation effect could have caused the vapor δ18O in the raining season to lower by 7% in average in July and August.

关键词： Delingha δ18O atmospheric water vapor

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APPLICATION OF FUZZY FLEXIBLE CLASSIFICATION IN RAINFED AGRICULTURAL DEMARCATION

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干旱区资源与环境 1993年第Z1期7卷 384-386页

作者： Wang Lianxi Ningxia meteorological observatory

The paper, by the flexible classification in fuzzy mathematics, uses precipitation, meantemperature, sunshine duration, dry index (namely evaporation to precipitation in the corre-sponding period) and cumulative temperature≥10°C between March to September asclassifying indices, and classifies the whole region of Ningxia. We have obtained resultswhich are basically in accordance with the previous divisions, but has some differences.

关键词： Fuzzy Flexible Classification Rainfed Agriculture Drought Index

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APPLICATION OF VEGETATION INDEX OF meteorological SATELLITE IN DROUGHT ANALYSIS OF NINGXIA

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干旱区资源与环境 1993年第Z1期7卷 379-381页

作者： Wang Lianxi Hu Wendong Zhang Feng Ningxia meteorological observatory, Yinchuan 750002, china

There are five channels in NOAA-N series meteorological satellites. The channel No.1 is exactly located in the absorbtion band of vegetation, the channel No. 2 in the strong re-flection one. Therefore the two channels are suitable for monitoring and analysing vegeta-tion. To make certain mathematical value combination of two channels and specify its val-

关键词： meteorological Satellite Vegetation Index Drought Condition Analysis

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Turbulent intensity and its similarity function over an Inner Mongolian grassland during spring

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Science china Earth Sciences 2010年第5期53卷 773-780页

作者： YUE Ping1,2,3, NIU ShengJie2, HU YinQiao4 & ZHANG Qiang1 1 Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province, Key Laboratory of Arid Climate Change and Reducing Disaster of CMA, Institute of Arid Meteorology, CMA, Lanzhou 730020, china 2 Nanjing University of Information Science and Technology, Nanjing 210044, china 3 Zhangye National meteorological observatory, Zhangye 734000, china 4 Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Science, Lanzhou 730000, china 1. Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province Key Laboratory of Arid Climate Change and Reducing Disaster of CMA Institute of Arid Meteorology CMA Lanzhou 730020 China2. Nanjing University of Information Science and Technology Nanjing 210044 China3. Zhangye National Meteorological Observatory Zhangye 734000 China4. Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Science Lanzhou 730000 China

Macroscopic reason for the development of turbulences in fluid is the conjunction action of velocity and temperature shears. We use the 2008 spring flux observations in the surface layer over Inner Mongolian grassland, obtain the similarity functions of turbulent intensity under different stratification stability conditions, and calculate the clear day turbulent intensity in the spring, which is then analyzed and compared with the observed values of turbulent intensity. The results show that in the Inner Mongolian grassland, under the condition of spring unstable stratification of the surface layer, dependence of the similarity function of turbulent intensity on stratification stability follows a "2/3 power law". The structural function is a constant under the neutral stratification condition, and complicated under the stable condition. The calculated turbulent intensity has a close correlation with the observed one, which verifies the accuracy of the similarity functions and the suitability of the theorem of turbulent intensity in the grassland region.

关键词： turbulent intensity variance of velocity similarity function grassland

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Potential　enstrophical　diagnostic　analyses　on　the　mechanism　of　change　of　tropical　cyclone　intensity

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Acta Oceanologica Sinica 1994年第3期13卷 361-375页

作者： Laing Biqi and He Caifu(This project is supported by the National Natural Science Foundation of china.).(Department of Atmospheric Science,Zhongshan University, Guangzhou 510275, china)( Jiangxi meteorological observatory, Nanchang 330046, china)

It is indicated that the change of mean potential enstrophy within tropical cyclone (TC) corresponds tothe change of TC intensity. A series of factors influencing the intensity change have been discussed by calculating budget of potential enstrophy in tangential wave-number domain in cylindric coordinates. The results indicate thatthe vertical distribution of mean diabatic heating is an important factor that influences the change of TC intensitythrough transformation mechanism of the Coriolis effect and cyclonic vorticity, especially in the sudden intensifyingstage of TC. It is favourable to the intensification when the diabatic heating is largest in upper-middle troposphere,while TC weakens when this kind of role of heating become small or the heating is largest in lower troposphere. Therole of the axisymmetric fields of TC is different from that of the non-axisymmetric fields. In addition,we have analysed some other factors that influence TC intensity.

关键词： Change of TC intensity potential enstrophy diabatic heating beating profile

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Influence of Fireworks Burning on Lhasa Urban Air Quality and Its countermeasures

Influence of Fireworks Burning on Lhasa Urban Air Quality an...

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第十届全国气溶胶会议暨第六届海峡两岸气溶胶技术研讨会

作者： Deqing Zhuoga (Tibet meteorological observatory,Lhasa Tibet 850000, china)

The paper analyzes the variety of air quality which was caused by the smoke and dust produced in burning of fireworks and motor vehicle combustion. Result shows that burning of fireworks and motor vehicle combustion which has an important influence on the air quality and the main pollutant is PM10. It has caused an obvious descent of air quality, so a suggestion was proposed that responsible department should take measures to prohibit burning fireworks to protect the urban air environment.

关键词： fireworks burning urban air quality air pollution countermeasures

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