检索结果-南通市图书馆

The Energy Cycle Associated to the Pacific Walker Circulation and Its Relationship to ENSO

Atmospheric and Climate Sciences 2013年第4期3卷 627-642页

作者： Jose Augusto P.Veiga Alexandre B.Pezza Tercio Ambrizzi V.Brahmananda Rao sergio h.franchito Marcos C.Yoshida Institute of Technology Amazon State UniversityManausBrazil School of Earth Sciences The University of MelbourneVictoriaAustralia Institute of Astronomy Geophysics and Atmospheric SciencesUniversity of Sao PauloSao PauloBrazil National Institute for Space Reseach Sao Jose dos CamposBrazil

In this paper we study the Lorenz energy cycle of the Walker circulation associated with ENSO. The robust formulation of the energetics allows drawing a clear picture of the global energy and conversion terms associated with the three dimensional domains appropriate to qualify the large scale transfers that influence, and are influenced by, the anomalies during ENSO. A clear picture has emerged in that El Nino and La Nina years have approximately opposite anomalous energy fluxes, regardless of a non-linear response identified in the potential energy fields (zonal and eddy). During El Ninos the tropical atmosphere is characterized by an increase of zonal available potential energy, decrease of eddy available potential energy and decrease of kinetic energy fields. This results in weaker upper level jets and a slowingdown of the overall Walker cell. During La Ninas reversed conditions are triggered, with an acceleration of the Walker cell as observed from the positive anomalous kinetic energy. The potential energy in the Walker circulation domain during the cold phase is also reduced. An equally opposite behavior is also experienced by the energy conversion terms according to the ENSO phase. The energetics-anomalous behavior seem to be triggered at about the same time when ENSO starts to manifest for both the positive and negative phases, suggesting a coupled mechanism in which atmospheric and oceanic anomalies interact and feed back onto each other.

关键词： Walker Circulation Energetics El Nino La Nina ENSO

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Studies of Climate Change with Statistical-Dynamical Models: A Review

引用

American Journal of Climate Change 2015年第1期4卷 57-68页

作者： sergio h. franchito Vadlamudi B. Rao Centro de Previsao de Tempo e Estudos Climáticos CPTEC Instituto Nacional de Pesquisas Espaciais INPE Sao José dos Campos Brazil

The cause-effect relationship is not always possible to trace in GCMs because of the simultaneous inclusion of several highly complex physical processes. Furthermore, the inter-GCM differences are large and there is no simple way to reconcile them. So, simple climate models, like statistical-dynamical models (SDMs), appear to be useful in this context. This kind of models is essentially mechanistic, being directed towards understanding the dependence of a particular mechanism on the other parameters of the problem. In this paper, the utility of SDMs for studies of climate change is discussed in some detail. We show that these models are an indispensable part of hierarchy of climate models.

关键词： Simple Climate Models Statistical-Dynamical Models Climate Change

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Surrogate Climate Change Scenario and Projections with a Regional Climate Model: Impact on the Aridity in South America

引用

American Journal of Climate Change 2014年第5期3卷 474-489页

作者： sergio h. franchito Julio P. Reyes Fernandez David Pareja Centro de Previsao de Tempo e Estudos Climáticos CPTEC Instituto Nacional de Pesquisas Espaciais INPE C.P. 515 12201-970 Sao José dos Campos Brazil

The impact of global warming on the aridity in South America (SA) is investigated. For this purpose, the methodology for generating surrogate climate-change scenarios with a RCM is employed. For the present climate (CTRL) the RCM is initialized with and driven by ECMWF/ERA-Interim reanalysis data. Two aridity indices are used: the Budyko and the UNEP indices. The results for the CTR are in agreement with other model studies which indicate future warming;rainfall increases in southeastern South America, Ecuador and Peru and decreases in the central and eastern Amazon. In general the model reproduces the aridity in the continent compared with the observed data for both indices. The distribution of aridity over SA in surrogate climate-change scenario shows an increase of the dryness in the continent. Over Amazonia the aridity increases 23.9% (for the UNEP index) and 3.1% (for the Budyko index), suggesting that portions of the Amazonia forest are replaced by dry land area. The semi-arid zone over northeast Brazil expands westward, attaining the interior of north Brazil. In this region the aridity increases 20% (for the UNEP index) and 0.6% (for the Budyko index) indicating that areas of humid regime may be occupied by areas with dry land regime. The RCM was also integrated driven by the AOGCM EChAM5/MPI-OM for the reference climate (CTRL2) and under A1B SRES scenario. The results for the present-day climate are similar in CTRL2 and CTRL, and are in agreement with CRU data. The distribution of the aridity for the present climate seems to be better represented in CTRL using both Budyko and UNEP indices. The changes in aridity (future climate minus control) are higher in the run forced by the A1B SRES scenario. Although the UNEP and Budyko indices show potentialities and limitations to represent the aridity distribution over SA, the changes in aridity due to a pseudo-scenario of global warming are higher using the UNEP index.

关键词： Aridity in South America Surrogate Climate-Change Scenario Regional Climate Model

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

how Accurately Contemporary Models Can Predict Monsoons?

引用

American Journal of Climate Change 2018年第1期7卷 97-113页

作者： V. Brahmananda Rao sergio h. franchito Clovis M. E. Santo S. S. V. S. Ramakrishna Julio P. R. Fernandez Center for Weather Prediction and Climate Studies INPE S&atilde o José dos Campos Brazil Department of Meteorology and Oceanography Andhra University Visakhapatanam India

Seasonal changes exhibit climate changes, so models can predict future climate change accurately only if they can reproduce seasonal cycle accu-rately. Further, seasonal changes are much larger than the changes even in long period of centuries. Thus it is unwise to ignore large ones compared to small climate change. In this paper, we determine how accurately a suite of ten coupled general circulation models reproduce the observed seasonal cycle in rainfall of the tropics. The seasonal cycles in rainfall of global tropics are known as monsoons. We found that the models can reasonably reproduce the seasonal cycle in rainfall, thus are useful in climate prediction and simulation of global monsoons.

关键词： Climate Change Monsoons Seasonal Change Tropical South America and India Rainfall Coupled General Circulation Models Projections of Future Climate IPCC Models

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

himalayan Warming and Climate Change in India

引用

American Journal of Climate Change 2016年第4期5卷 558-574页

作者： Vadlamudi Brahmananda Rao sergio henrique franchito Renato Orrú Pedroso Gerólamo Emanuel Giarolla Surireddi Satyavenkata Venkata Siva Ramakrishna Bodda Ravi Srinivasa Rao Chennu Vankateswara Naidu Center for Weather Prediction and Climate Studies INPE S?o José dos Campos S.P. Brazil Department of Meteorology and Oceanography Andhra University Visakhapatanam India

Recent studies showed that the himalayan glaciers are reducing alarmingly. This is attributed to global warming. Since the melt water of himalayan glaciers and snow is the principal source of water for several rivers, a decrease of this source is a calamity for the large fraction of global population living in nearby regions such as India. In Asia for the 60% global population only 36% of global water is available. Any further decrease of this vital necessity makes the very existence of billions of people doubtful. here we show, using both observations and one IPCC-AR4 model with high horizontal resolution, that the himalayan region in fact underwent a maximum warming of 2.5°C from 1950 to 1999 and would reach the highest temperature rise of 9°C in 2100. Temperature and rainfall variations determine a simple climate classification proposed by Köppen. We show changes that occur in climate and biosphere using this classification. Also we discussed the impact of warming and resulting changes in Köppen climates on the floods and malaria in India.

关键词： himalayan Glaciers Global Warming Floods in India Malaria in India IPCC AR4 Model Köppen Climates

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：