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		<citationkey>SouzaSeDaGoSaLoKu:2006:20DrAm</citationkey>
		<title>On the 2005 drought in the Amazon River Basin</title>
		<format>CD-ROM, On-line.</format>
		<year>2006</year>
		<secondarytype>PRE CI</secondarytype>
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		<author>Souza, Everaldo B.,</author>
		<author>Senna, Renato C.,</author>
		<author>Dallarosa, Ricardo L. G.,</author>
		<author>Gonçalves, Flavio A. V.,</author>
		<author>Saraiva, Jaci M. B.,</author>
		<author>Lopes, Jorge L. M.,</author>
		<author>Kuhn, Paulo A. F.,</author>
		<affiliation>Divisão de Meteorologia, CTO-MN, Sistema de Proteção da Amazônia (SIPAM),</affiliation>
		<affiliation>Av. do Turismo 1350, Tarumã, 69049-630 Manaus-AM, Brasil.,</affiliation>
		<electronicmailaddress>esouza@atech.br, everaldobsouza@yahoo.com.br,</electronicmailaddress>
		<editor>Vera, Carolina,</editor>
		<editor>Nobre, Carlos,</editor>
		<e-mailaddress>esouza@atech.br</e-mailaddress>
		<conferencename>International Conference on Southern Hemisphere Meteorology and Oceanography, 8 (ICSHMO).</conferencename>
		<conferencelocation>Foz do Iguaçu</conferencelocation>
		<date>24-28 Apr. 2006</date>
		<publisher>American Meteorological Society (AMS)</publisher>
		<publisheraddress>45 Beacon Hill Road, Boston, MA, USA</publisheraddress>
		<pages>1209-1215</pages>
		<booktitle>Proceedings</booktitle>
		<tertiarytype>Oral</tertiarytype>
		<organization>American Meteorological Society (AMS)</organization>
		<transferableflag>1</transferableflag>
		<keywords>Amazonia, drought, rainfall, Atlantic Ocean.</keywords>
		<abstract>The regional meteorological conditions of a long lasting drought observed in Amazonia during 2005, as well as the main large-scale oceanic and atmospheric mechanisms associated are documented in this work. During rainy season (November 2004 to May 2005) and specially during dry season (June to September 2005), the spatial and temporal configuration of rainfall was very irregular with predominance of values below to very below of normal in most of Amazonian basin. The persistency of rainfall deficit was very accentuated particularly in western and southern Amazonia, including headboard regions of Solimões, Negro, Juruá, Purus and Madeira rivers, which give significant contribution to fluvial regime of Amazon River Basin. During this period, the large-scale patterns were associated with a persistency of oceanic water warmer than normal covering most of the north basin of Atlantic and also in subtropical portion of south Atlantic Ocean. These persistent and anomalous patterns resulted in significant changes in South American meridional tropospheric circulation related to Hadley cell, so that a compensatory subsidence branch was verified over southern Amazonia, which inhibited strongly the development of tropical convection, explaining the drought condition in the region. Additionally, the configuration of episodes with anticyclonic circulation regime affecting the central and northeastern Brazil blocked meridional propagation of extratropical frontal systems into low latitudes of South America, which also contribute to below normal rainfall observed in Amazonia.</abstract>
		<area>MET</area>
		<type>Monsoon systems and continental rainfall</type>
		<language>en</language>
		<targetfile>1209-1216.pdf</targetfile>
		<usergroup>esouza@atech.br administrator</usergroup>
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