CEOP has a number of Cross-Cutting Studies (CCS) that is being pursued in collaboration with the Regional Studies, RHPs and Modeling Studies. These regional include Water and Energy Budget Study, Extremes, Aerosols, and Isotopes projects.
http://www.itpcas.ac.cn/users/webs/
Chair: Kun Yang (yangk@itpcas.ac.cn)
A WEBS was first initiated by GEWEX/GHP to develop the “best available water and energy budgets”, for the global land regions associated with the GEWEX CSEs. GEWEX Phase I Results have now addressed regional variability of water and energy components, the importance of land surface parameterization for precipitation forecast, and the importance of Continental-Scale Experiments in closure of the regional water and energy budgets.
The CEOP WEBS element will merge research activities of GHP WEBS with activities of the ‘CEOP’ Water and Energy Simulation and Prediction (WESP) (such as multi-model inter-comparisons). The CEOP/WEBS is now helping CEOP to develop situ data, model output, satellite in a form that can be exchanged and disseminated Based on this CEOP integrated data of observations, satellite products, and model output, CEOP/WEBS will address the following key issues related to data quality, model deficiencies and science:
Water and energy budgets are a broad topic in the GEWEX research community. The WEBS is trying to define its scope to be an analysis and assessment project (though it also covers modeling and data assimilation) and to address regional water and energy budget more than global one. It is a data-based project, and needs strong collaboration from RHPs, NWP centers, space agencies, data integration centers. The WEBS group will work jointly with other groups (CEOP subprojects, GRP-SRB and GMPP-follow-on) on some topics for improving quantitative knowledge on water and energy budgets from local short-term to global long-term (multi-decadal) scales.
WEBS Objectives:
Based on CEOP integrated data of observations, satellite products, and model output, WEBS will evaluate and analyze regional water and energy budget. According to discussions during the 6th and 7th CEOP implementation planning meetings, CEOP WEBS will:
http://www.drinetwork.ca/extremes/
Chair: Ron Stewart (ronald.stewart@mcgill.ca)
A fundamental aspect of the water and energy cycle is the occurrence of extremes. Extremes develop and evolve on a continual basis within the current climate system, and they lead to enormous impacts when and where they occur. How can we improve our understanding and prediction of extremes? To what extent will the types, distributions, and impacts of extremes change in a world with an altered climate? Extremes will systematically address these issues within the present climate system and this solid foundation will then allow us to contribute significantly to understanding to what extent they may change in the future.
Extremes initially to be studied are those with a ‘climatologically significant duration and/or spatial extent’ as opposed to individual, short-term events such as thunderstorms or flash floods. This perspective includes:
Associated research will include, for example:
Specific scientific issues to be addressed include:
Extremes research will be carried out through several activities. This includes the potential development of new measures of extremes for droughts and extended wet periods, updating datasets on extremes, the analysis of several ‘case studies’ of extremes, and the examination of trends of extremes. It may also include ‘case studies’ of extremes within climate scenarios.
Chairs: William Lau (william.k.lau@nasa.gov)
As a result of the work in 'CEOP' Inter-Monsoon Study (CIMS) to understand and document the seasonal, diurnal and intraseasonal variation of the monsoon systems, and to carry out inter-monsoon comparison studies to identify possible physical connections, and common features, we have identified aerosol-monsoon water cycle interaction as an important common problem in all monsoon regions that has not received enough attention under the existing panel structure of CLIVAR and GEWEX. Under the new aerosol-cross cut initiative of CEOP, we will examine the impact of aerosol radiative forcing in affecting diurnal to seasonal cycles, as well as evaluating impacts on climate variability and change.
To summarize, the objectives of CEOP Aerosol activities are to:
The CEOP Aerosol-Water Cycle Cross-Cut (CAWC) is aimed at multi-disciplinary studies of aerosol effects on the regional and water cycle, including forcing and responses of the climate system. It addresses scientific issues associated with aerosol-clouds-precipitation-climate interaction, from the perspective of the continental scale water cycle. The scientific objective of CAWC is:
Major science issues to be addresses are:
CAWC will draw on the diverse expertise in the current CEOP new organization, with strong interactions among the following elements: AMMA, RHPs (particularly, AMMA, MAHASRI, CPPA, LBA), and synergy with the CEOP elements of Semi-Arid, High-Elevation, WEBS, Extremes. CAWC plans to implement the following initiatives in conjunction with the Asian Monsoon Year and International Monsoon Year (2008-2012):
Both initiatives are now underway, with strong community support. CEOP reference data, satellite data and field campaign observations will be used to validate numerical experiments using high-resolution RCMs, e.g. WRF, coupled to LSM over high mountain regions, e.g., Himalayas, semi-deserts or desert regions, with and without interactive aerosol, and/or land surface forcing to determine their relative roles in maintenance of the continental scale water cycle, and causes of droughts and floods.
Co-Chairs: David Noone (dcn@colorado.edu); Kei Yoshimura (k1yoshimura@ucsd.edu)
The Isotope Cross Cut Study (ICCS) contributes to CEOP by facilitating isotope studies, which augment and enhance the predominant non-isotope studies within GEWEX/CEOP. The ICCS includes modeling (both validation and assessment), process studies from in situ and remote sensed data, and integration of these studies with other CEOP studies.
The ICCS includes a modeling research group called Stable Water Isotope Working Group (SWING; http://atoc.colorado.edu/~dcn/SWING). The SWING aims to use water isotope information to understand water cycle processes and to quantify their role in climate and climate feedbacks. The SWING incorporates an intercomparison of current state-of-the-art water isotope general circulation models and related observational isotope data. It brings together scientists with a common wide range of interest in both modeling and measuring stable water isotopes (H218O, HDO) and its application to earth system problems with a special focus on atmospheric hydrologic balance and water movement in the land surface. Recent developments in satellite observational capability have allowed water isotope measurements and have become an integral part of SWING. Since the isotope information provided through ICCS/SWING is of great utility for diagnosing cloud processes and surface exchange in models and in nature, there are many opportunities to work with other groups, which are not presently being exploited. An example of success was the Isotopes in Project for Intercomparison of Land-surface Parameterization Schemes (IPILPS) project, which used land models from the SWING models and other models to assess surface energy and water balance with isotopes.
Specific opportunities for partnership with existing GEWEX activities include an isotope counterpart to, for instance, GEWEX Cloud System Study (GCSS). Similar isotope partnerships would assist activities such as WEBS. An example of success from such an interaction was the extension of the PILPs program to include an isotope element (IPILPS) that lead to further insight into the ability (or otherwise) of land surface parameterization schemes to not only simulate local surface water and energy balance, but to do so in the right way. The same approach could be adopted for cloud parameterizations; river and ground water flow models and large (continental) scale energy and water budgets. While these new opportunities have not been realized, planning for the isotope crosscut under CEOP is such that these can be developed.
A key function of the isotope crosscut is facilitation access to isotopic datastreams (both observations, model simulation results and remote sensing data) that are otherwise difficult to obtain for integrative studies. This requires the establishment of data storage capabilities. For the implementation under CEOP it is recommended that:
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Last Updated: 2010/07/16 12:12 (JST)
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