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Uma das formas de se estudar a precipitacao pluvial de determinada regiao e atraves de Indices de Anomalia de Chuva (IAC). Nesse contexto, o presente trabalho teve como objetivo analisar o IAC em seis municipios de diferentes mesorregioes do Estado do Rio Grande do Norte, evidenciando os anos de seca e chuva. Mossoro, Apodi, Cruzeta, Santa Cruz, Natal e Ceara Mirim foram os municipios selecionados. Os dados de precipitacao pluvial das series historicas foram obtidos na Empresa de Pesquisa Agropecuaria do Rio Grande do Norte (EMPARN), e os calculos do IAC foram realizados com base na normal climatologica e medias dos 10 anos de maximas e minimas precipitacoes. A classificacao de anos secos e chuvosos foi feita de acordo com as classes de intensidade do IAC. Dentre os municipios analisados, Natal foi o mais chuvoso, reflexo da precipitacao media anual (1656,3 mm), com o IAC variando entre -4,47 e 6,78. Cruzeta apresentou 29 anos com desvios negativos e 25 anos com desvios positivos. Mossoro foi a unica cidade a apresentar 2 anos extremamente secos, e teve o IAC variando entre -4,12 e 6,78. Diferentemente de Mossoro, Ceara Mirim teve dois anos extremamente chuvosos, e o IAC variou entre -4,43 e 5,07. Apodi foi a cidades que mais apresentou eventos secos, e a cidade de Santa Cruz foi a unica que nao apresentou nenhum ano extremamente seco. Concluiu-se que a utilizacao do IAC garante resultados mais precisos referentes ao grau de variacao da chuva em torno da normal climatologica. A B S T R A C T One way to study the rainfall of the determined region is through Rain Anomaly Indexes (IAC). In this context, the present work had the objective of analyzing the IAC in six municipalities of different mesoregions of the State of Rio Grande do Norte, evidencing the years of drought and rain. Mossoro, Apodi, Cruzeta, Santa Cruz, Natal e Ceara Mirim were the municipalities selected. The rainfall data of the historical series were obtained from the Agricultural Research Company of Rio Grande do Norte (EMPARN), and the calculations of the IAC were performed based on the normal climatologica and averages of 10 years of maximum and minimum precipitations. The classification of dry and wet years was made according to intensity classes of IAC.  Among the municipalities analyzed, Natal was the wettest, reflecting the annual average precipitation (1656,3 mm), with the IAC ranging between -4,47 and 6,78. Cruzeta presented 29 years with negative deviations and 25 years with positive deviations. Mossoro was the only city to present two extremely dry years, and had IAC varying between -4,12 e 6,78. Unlike Mossoro, Ceara Mirim had two extremely wet years, and the IAC ranged between -4,43 and 5,07. Apodi was the city that more presented dry events, and the Santa Cruz city  was the only one that did not present dry years.  It was concluded that the use of IAC guarantees more accurate results regarding the degree of rain variation around the climatological normal. Keywords: rainfall; historical data; intensity class.

revista brasileira de geografia física

Índice de anomalias de chuva para diferentes mesorregiões do Estado do Rio Grande do Norte (Rain Anomaly Index for different mesoregions of Rio Grande do Norte state)