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Analysis of Moisture Transport from Amazonia to Southeastern Brazil During the Austral Summer

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  • معلومة اضافية
    • Contributors:
      CAPES
    • بيانات النشر:
      Universidade Federal de Pernambuco
    • الموضوع:
      2020
    • Collection:
      Portal de Periódicos - UFPE (Universidade Federal de Pernambuco)
    • الموضوع:
    • الموضوع:
      Decadas
    • نبذة مختصرة :
      In two recent Austral summers (between the years 2013/14 and 2014/15), a southeastern region of Brazil suffered a period of severe drought. The main convective activity during the summer (mainly responsible for the rain) is an interconnected band of cloudiness with NW / SE orientation, which extends from the adjacent Atlantic Ocean to the SW of the Amazon, being called the South Atlantic Convergence Zone (SACZ). In addition to the SACZ, the passage of frontal systems also affects the rainfall distribution as well as some moisture oceanic input from the Atlantic Subtropical High pressure. Thus, the main objective of this work is to compute the moisture transfer from the Amazon region to the south and southeast of Brazil and associate it with the precipitation pattern. In addition, the influence of different types of El Niño Southern Oscillation (ENSO) in the moisture flow, for instance, Central (higher temperatures in the central equatorial Pacific) and East (higher temperatures in the eastern equatorial Pacific) were also studied. The summer of 2013/14 was the driest of the series (1979 - 2016). Although it was below the climatology, the precipitation trend found for the period is not significant, according Mann-Kendall test. However, it is clearly notable the importance of the moisture transport from the Amazon region to the southeast in neutral years, providing huge accumulated rainfall. Moreover, it is possible to affirm that there is a such significant difference in the intensity of the moisture flow in neutral years. Although, this intensity can be influenced by the position of the greatest anomaly of the sea surface temperature (ASST) in the Pacific. In other words, if this anomaly is greater in the eastern portion of the ocean (named as East El Niño Leste) an intensification in the flow is identified which will produce a greater amount of moisture in the regions. However, if the ASST is greater in the central region (El Niño Central), this intensification is lower, which may result in changes in the ...
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      application/pdf
    • Relation:
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    • الرقم المعرف:
      10.26848/rbgf.v13.6.p2650-2670
    • Rights:
      Direitos autorais 2020 Revista Brasileira de Geografia Física ; https://creativecommons.org/licenses/by/4.0
    • الرقم المعرف:
      edsbas.B4F7AEE6