6 research outputs found

    GEWEX water vapor assessment (G-VAP): final report

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    Este es un informe dentro del Programa para la Investigaci贸n del Clima Mundial (World Climate Research Programme, WCRP) cuya misi贸n es facilitar el an谩lisis y la predicci贸n de la variabilidad de la Tierra para proporcionar un valor a帽adido a la sociedad a nivel pr谩ctica. La WCRP tiene varios proyectos centrales, de los cuales el de Intercambio Global de Energ铆a y Agua (Global Energy and Water Exchanges, GEWEX) es uno de ellos. Este proyecto se centra en estudiar el ciclo hidrol贸gico global y regional, as铆 como sus interacciones a trav茅s de la radiaci贸n y energ铆a y sus implicaciones en el cambio global. Dentro de GEWEX existe el proyecto de Evaluaci贸n del Vapor de Agua (VAP, Water Vapour Assessment) que estudia las medidas de concentraciones de vapor de agua en la atm贸sfera, sus interacciones radiativas y su repercusi贸n en el cambio clim谩tico global.El vapor de agua es, de largo, el gas invernadero m谩s importante que reside en la atm贸sfera. Es, potencialmente, la causa principal de la amplificaci贸n del efecto invernadero causado por emisiones de origen humano (principalmente el CO2). Las medidas precisas de su concentraci贸n en la atm贸sfera son determinantes para cuantificar este efecto de retroalimentaci贸n positivo al cambio clim谩tico. Actualmente, se est谩 lejos de tener medidas de concentraciones de vapor de agua suficientemente precisas para sacar conclusiones significativas de dicho efecto. El informe del WCRP titulado "GEWEX water vapor assessment. Final Report" detalla el estado actual de las medidas de las concentraciones de vapor de agua en la atm贸sfera. AEMET ha colaborado en la generaci贸n de este informe y tiene a unos de sus miembros, Xavier Calbet, como co-autor de este informe

    CIRA annual report FY 2014/2015

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    Reporting period July 1, 2014-March 31, 2015

    CIRA annual report FY 2016/2017

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    Reporting period April 1, 2016-March 31, 2017

    Asynchronous, distributed optimization for the coordinated planning of air and space assets

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    Thesis (S.M.)--Massachusetts Institute of Technology, Sloan School of Management, Operations Research Center, 2010.Cataloged from PDF version of thesis.Includes bibliographical references (p. 189-194).Recent decades have seen the development of more advanced sensor and communication systems, with the future certainly holding more innovation in these areas. However, current operations involve "stovepipe" systems in which inefficiencies are inherent. In this thesis, we examine how to increase the value of Earth observations made by coordinating across multiple collection systems. We consider both air and space assets in an asynchronous and distributed environment. We consider requests with time windows and priority levels, some of which require simultaneous observations by different sensors. We consider how these improvements could impact Earth observing sensors in two use areas; climate studies and intelligence collection operations. The primary contributions of this thesis include our approach to the asynchronous and distributed nature of the problem and the development of a value function to facilitate the coordination of the observations with multiple surveillance assets. We embed a carefully constructed value function in a simple optimization problem that we prove can be solved as a Linear Programming (LP) problem. We solve the optimization problem repeatedly over time to intelligently allocate requests to single-mission planners, or "sub-planners." We then show that the value function performs as we intend through empirical and statistical analysis. To test our methodologies, we integrate the coordination planner with two types of sub-planners, an Unmanned Aerial Vehicle (UAV) sub-planner, and a satellite sub-planner. We use the coordinator to generate observation plans for two notional operational Earth Science scenarios. Specifically, we show that coordination offers improvements in the priority of the requests serviced, the quality of those observations, and the ability to take dual collections. We conclude that a coordinated planning framework provides clear benefits.by Thomas Michael Herold.S.M

    Research theme reports from April 1, 2019 - March 31, 2020

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    CIRA annual report FY 2015/2016

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    Reporting period April 1, 2015-March 31, 2016
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