检索结果-南通市图书馆

维普期刊数据库

Variational iteration solving method for El Nio phenomenon atmospheric physics of nonlinear model

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2005年第5期 39-42页

作者： MO Jiaqi1, 2 *, WANG Hui3, LIN Wantao4, LIN Yihua41. Anhui Normal University, Wuhu 241000, china2. Division of Computional Science, E-institute of Shanghai Universities, Shanghai Jiaotong University Shanghai 200240, china3. chinese academy of Meteorological sciences, beijing 100081,china4. state laboratory of numerical modeling for atmospheric sciences and geophysical fluid dynamics, institute of Atmosheric physics, chinese academy of sciences, beijing 10002., china

A class of El Nino atmospheric physics oscillation model is considered. The El Nino atmospheric physics oscillation is an abnormal phenomenon involved in the tropical Pacific ocean-atmosphere interactions. The conceptual oscillator model should consider the variations of both the eastern and western Pacific anomaly patterns. An El Nino atmospheric physics model is proposed using a method for the variational iteration theory. Using the variational iteration method, the approximate expansions of the solution of corresponding problem are constructed. That is, firstly, introducing a set of functional and accounting their variationals, the Lagrange multiplicators are counted, and then the variational iteration is defined, finally, the approximate solution is obtained. From approximate expansions of the solution, the zonal sea surface temperature anomaly in the equatorial eastern Pacific and the thermocline depth anomaly of the sea-air oscillation for El Nino atmospheric physics model can be analyzed. El Nino is a very complicated natural phenomenon. Hence basic models need to be reduced for the sea-air oscillator and are solved. The variational iteration is a simple and valid approximate method.

关键词： nonlinear variational iteration method El Nino phenomenon

Assessment of Dust Aerosol Optical Depth and Shortwave Radiative Forcing over the Northwest Pacific Ocean in Spring Based on Satellite Observations

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

atmospheric and Oceanic Science Letters 2009年第4期 223-228页

作者： CHEN Lin 1,2,SHI Guang-Yu 1,ZHONG Ling-Zhi 3,and TAN Sai-Chun 1 1 state key laboratory of numerical modeling for atmospheric sciences and geophysical fluid dynamics,institute of atmospheric physics,chinese academy of sciences,beijing 10002.,china 2 key laboratory of Radiometric Calibration and Validation for Environmental Satellites (KLRCV),National Satellite Meteorology Center,china Meteorological Administration (NSMC/CMA),beijing,100081,china 3 state key laboratory of Severe Weather,chinese academy of Meteorological sciences,beijing 100081,china state key laboratory of numerical modeling for atmospheric sciences and geophysical fluiddynamics Institute of Atmospheric physics Chinese Academy of Sciences Beo＇ing 100029 China key laboratory of Radiometric Calibration and Validation for Environmental Satellites （KLRCV） National Satellite Meteorology Center China Meteorological Administration （SMC/CMA） Beijing 100081 China state key laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing 100081 China

Dust aerosol optical depth (AOD) and its ac-companying shortwave radiative forcing (RF) are usually simulated by numerical ***,by using 9 months of Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol product data in combination with Clouds and the Earth’s Radiant Energy System Single Scanner Footprint (CERES/SSF) data,dust AOD and its shortwave RF were estimated over the cloud-free north-west (NW) Pacific Ocean in the springs of 2004,2005,and *** results showed that in this region,the mean dust AOD and its shortwave RF were 0.10 and 5.51 W m 2,*** order to validate the dust AOD de-rived by MODIS,results from the Goddard Global Ozone Chemistry Aerosol Radiation and Transport (GOCART) model were also used *** correlation coefficient between the monthly averaged dust AOD derived by MODIS measurements and the model simulation results was approximately *** the estimates of the dust AOD and its shortwave RF obtained in this study are based mainly on satellite data,they offer a good reference for numerical models.

关键词： dust aerosols optical depth shortwave radiative forcing northwest Pacific satellite measurements

The Role of Land-Sea Distribution in the Formation of the Asian Summer Monsoon

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

The Role of Land-Sea Distribution in the Formation of the As...

第六次全国动力气象学术会议

作者： Xiaoyun Liang, Yimin Liu, and Guoxiong Wu state key laboratory of numerical modeling for atmospheric sciences and geophysical fluid dynamics, institute of atmospheric physics, chinese academy of sciences, Climate Diagnostics and Prediction Division, National Climate Center

＜正＞ The role of land-sea distribution in the formation of the Asian summer monsoon is examined through a series of idealized numerical experiments. Results show that the existence and geometric shape of land-sea distribution crucially affect the Asian summer monsoon. In an aqua-planet case, no monsoon is observed. In an experiment in which only the subtropical Eurasian landmass exists, there is a weak summer

关键词：

Simulation of sea surface temperature changes in the Middle Pliocene warm period and comparison with reconstructions

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science Bulletin 2011年第9期56卷 892-901页

作者： YAN Qing1,2*, ZHANG ZhongShi3,1*, WANG HuiJun1,4, JIANG DaBang1,4,5 & ZHENG WeiPeng6 1 Nansen-Zhu International Research Centre, institute of atmospheric physics, chinese academy of sciences, beijing 10002., china 2 Graduate University of chinese academy of sciences, beijing 100049, china 3 Bjerknes Centre for Climate Research, UniResearch, Bergen N-5007, Norway 4 Climate Change Research Center, chinese academy of sciences, beijing 10002., china 5 key laboratory of Regional Climate-Environment Research for Temperate East Asia, chinese academy of sciences, beijing 10002., china 6 National key laboratory of numerical modeling for atmospheric sciences and geophysical fluid dynamics, institute of atmospheric physics, chinese academy of sciences, beijing 10002., china Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Graduate University of chinese academy of sciences Beijing 100049 China Bjerknes Centre for Climate Research UniResearch Bergen N-5007 Norway Climate Change Research Center Chinese Academy of Sciences Beijing 100029 China key laboratory of Regional Climate-Environment Research for Temperate East Asia Chinese Academy of Sciences Beijing 100029 China National key laboratory of numerical modeling for atmospheric sciences and geophysical fluid dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

The Middle Pliocene (ca 3.12–2.97 Ma) is a recent warm period in the Earth’s history. In many respects, the warmth of the Middle Pliocene is similar to the probable warm situation of the late 21st century predicted by climate models. Understanding the Middle Pliocene climate is important in predicting the future climate with global warming. Here, we used the latest reconstructions for the Middle Pliocene—Pliocene Research Interpretation and Synoptic Mapping (PRISM) version 3—to simulate the Middle Pliocene climate with a fully coupled model Fast Ocean Atmosphere Model. From comparison of the results of simulations with reconstructions, we considered two important scientific topics of Middle Pliocene climate modeling: extreme warming in the subpolar North Atlantic and a permanent El Ni?o in the tropical Pacific. Our simulations illustrate that the global annual mean sea surface temperature (SST) in the Middle Pliocene was about 2.3°C higher than that in the pre-industrial era. The warming was stronger at midand high latitudes than at low latitudes. The simulated SST changes agree with SST reconstructions in PRISM3 data, especially for the North Atlantic, North Pacific and west coast of South America. However, there were still discrepancies between the simulation of the SST and reconstructions for the subpolar North Atlantic and tropical Pacific. In the case of the Atlantic, the weakened meridional overturning circulation in the simulation did not support the reconstruction of the extremely warm condition in the subpolar North Atlantic. In the case of the tropical Pacific, the whole ocean warmed, especially the eastern tropical Pacific, which did not support the permanent El Ni?o suggested by the reconstruction. From evaluation of the modeling and reconstruction, we suggest that the above discrepancies were due to uncertainties in reconstructions, difficulties in paleoclimate modeling and deficiencies of climate models. The discrepancies should be reduced through cons

关键词： Middle Pliocene sea surface temperature permanent El Ni?o numerical modeling extreme warming

Weakening Trend in the atmospheric Heat Source over the Tibetan Plateau during Recent Decades. Part Ⅱ: Connection with Climate Warming

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Weakening Trend in the Atmospheric Heat Source over the Tibe...

第七届全国优秀青年气象科技工作者学术研讨会

作者： ANMIN DUAN AND GUOXIONG WU state key laboratory of numerical Modelling for atmospheric sciences and geophysical fluid dynamics, institute of atmospheric physics, chinese academy of sciences, beijing, china (Manuscript received 30 June 2008, in final form 2 March 2009)

In Part I the authors have shown that heating sources in spring over the Tibetan Plateau （TP）, and in particular the sensible heat flux （SHF）, exhibit a significant weakening trend since the mid-1980s that is induced mainly by decreased surface wind speed. The possible reason of such a change is further investigated in Part II by analyzing historical observations and the NCEP/Department of Energy （DOE） reanalysis. The steady declining trend in the surface wind speed over the TP after the 1970s arises mainly from the zonal component. Since the mean altitude of the TP is about 600 hPa and the surface flow is controlled by the East Asian subtropical westerly jet （EASWJ） for most parts of the year, the substantial tropospheric warming in the mid- and high latitudes to the north of the plateau results in a decrease of the meridional pressure gradient in the subtropics. As a result, the EASWJ and the surface winds over the TP are decelerated. Moreover, changes of the general circulation in the twentieth century simulated by 16 coupled climate models driven by natural and anthropogenic forcings are examined. Intercomparison results suggest that sulfate aerosol indirect effects and ozone may be important in reproducing the weakening trend in EASWJ. Although nearly half of the models can successfully reproduce the observed trends in the EASWJ during the last two decades, there is an obvious spread in simulation of the spatial patterns of twentieth-century tro-pospheric temperatures, suggesting significant room still exists for improvement of the current state-of-the-art coupled climate models.

关键词：

A Further Investigation on Tropical Indian Ocean Dipole Index

在线全文

cnki会议

学校读者我要写书评

暂无评论

A Further Investigation on Tropical Indian Ocean Dipole Inde...

第三届中日韩气象学术会议

作者： Tan Yanke~1 Du Zhencai~2 Li Chongyin~(1 3) 1 Lab for Applied Geophysics institute of Meteorology PLA University of Science and Technology Nanjing 211101 2 Graduate University of chinese academy of sciences beijing 100049 3 state key laboratory of numerical modeling for atmospheric sciences and geophysical fluid dynamics institute of atmospheric physics chinese academy of sciences beijing 10002.

＜正＞The Indian Ocean Dipole（IOD）mode,which is also known as the Indian Ocean Zonal mode,is characterized by an east-west dipole pattern in sea surface temperature （SST）*** SST anomalies are found to be closely associated with changes in surface *** anomalous winds related to IOD raise（deepen）the thermocline in the east（west）that gives rise to a subsurface ***,data analyses revealed that the SST anomalies in the eastern tropical Indian Ocean（TIO）,together with the temperature anomalies above 50m and below 150m in situ,are positively related to the western *** temperature anomalies in subsurface from 50- 150m in the eastern TIO are negatively related to the analogue in the western *** a consequence,the subsurface dipole pattern is much stronger than the mode in the *** fact,the primary modes of SST anomalies are composed by the monopole pattern and *** former with basin wide same sign,are reacts of SST in TIO to ENSO at interannual time scale and to the global warming by the surface thermal fluxes between air and *** latter are dominated by the ocean-atmosphere dynamic *** such a way a new index of IOD are revised in terms of SST anomalies with monopole *** revised index gives a similar structure in surface to the pattern in subsurface,i.e.,the eastern pole exists in the southeast TIO, and the western pole is consisted of two centers off equatorial Indian *** structure implies that the western anomalies are possible Rossby-like response to the eastern *** composite of extreme IOD events shows that the evolutions are rather a local seesaw style oscillation than *** work is supported by china National Natural Science Foundation under grant 40405010.

关键词： air-sea interaction Indian Ocean Dipole anomalous temperature pattern

The relationship between middle stratiform clouds and large scale circulation over eastern china

在线全文

cnki会议

学校读者我要写书评

暂无评论

The relationship between middle stratiform clouds and large ...

中国气象学会2006年年会“气候变化及其机理和模拟”分会场

作者： Yunying Li1,2 and Hong Gu21 state key laboratory of numerical modeling for atmospheric sciences and geophysical fluid dynamics (LASG), institute of atmospheric physics, chinese academy of sciences, beijing, china. 2 institute of Meteorology, PLA University of Science and Technology, Nanjing,china.

Eastern china is the globally unique land region with lots of middle stratiform clouds in cold seasons. The distribution of this specific stratiform cloud is determined by three main factors, viz, rel

关键词：

Statistical characteristics of the double ridges of subtropical high in the Northern Hemisphere

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science Bulletin 2005年第20期 82-87页

作者： ZHAN Ruifen1,2,3, LI Jianping1 & HE Jinhai2 1. state key laboratory of numerical modeling for atmospheric Sci- ences and geophysical fluid dynamics (LASG), institute of Atmos- pheric physics, chinese academy of sciences, beijing 10002., china 2. Department of atmospheric sciences, institute of Meteorology, Nan- jing University of Information Science and Technology, Nanjing 210044, china 3. Graduate School of the chinese academy of sciences, beijing 100039, china

The generality and some climatological charac- teristics of the double ridge systems of subtropical high (SH) are investigated statistically by using the daily NCEP/NCAR reanalysis data from 1958 to 1998. The results show that the SH double-ridge event is a common phenomenon in the Northern Hemisphere, with the distinct seasonal and re- gional features, that is, the majority of SH double-ridge geneses concentrate over the eastern North India Ocean- western North Pacific as well as the central North Pacific in the period from mid-July to mid-September. Especially over the western North Pacific subtropics, the SH double-ridge events are extremely active. It is found that the life cycle of most double-ridge events of western Pacific subtropical high (WPSH) is shorter but some still last longer. The WPSH dou- ble-ridge events occur most frequently from July to Septem- ber, while there is a paucity of occurrences during Novem- ber-March. Also, it is shown that the WPSH double-ridge events have a strong interannual variation with a certain periodicity which possesses a remarkably abrupt change in the mid-1970s. Additionally, the relationship between the WPSH double ridges and the meridional movement of WPSH is discussed.

关键词： subtropical high double ridges statistical characteristics meridional movement.

Formation of the thermal-driven boundary jet in an f-plane mesoscale basin

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china Earth sciences 2008年第1期51卷 152-160页

作者： FENG LiCheng1,2 & CHAO JiPing3,4 1 state key laboratory of numerical modeling for atmospheric Science and geophysical fluid dynamics (LASG), institute of atmospheric physics, chinese academy of sciences, beijing 10002., china 2 Graduate University of the chinese academy of sciences, beijing 100049, china 3 National Marine Environment Forecast Center, beijing 100081, china 4 First institute of Oceanography, state Oceanic Administration, Qingdao 266061, china 1. state key laboratory of numerical modeling for atmospheric Science and geophysical fluid dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China 2. Graduate University of the chinese academy of sciences Beijing 100049 China 3. National Marine Environment Forecast Center Beijing 100081 China 4. First institute of Oceanography State Oceanic Administration Qingdao 266061 China

The paper adopts an f-plane quasi-geostrophic inertial model without linearization to investigate the perturbation temperature, boundary jet and upwelling (downwelling) in an idealized rectangular basin, under the consideration of west side friction layer and heat conservation. There is net heat input on the upper surface and equal quality heat dissipation on the west boundary, and without heat exchange on other boundaries, then the heat is conservation in the whole basin. Results show that there is thermal front due to denseness of the perturbation temperature in the west side boundary, the perturbation pressure and flow field are reversal on the upper layer and bottom layer. On the bottom layer, the west coastal current is northward, and the maximum perturbation pressure center is on the west, however, on the upper layer, the east coastal current is southward, and the maximum perturbation pressure center is on the east. There is strong vertical flow in narrow western boundary layer, and also in the central zone. The effect of different upper thermal forcings is also studied, and it can be concluded that there is always temperature denseness and boundary jet near the west boundary, and the appearance of flow field reversal, but the distribution of vertical flow is rather different.

关键词： boundary jet vertical flow thermal front thermal-driven heat conservation

维普期刊数据库