Easterly Wave Disturbances over Northeast Brazil: An Observational Analysis

المؤلفون المشاركون

Gomes, Helber Barros
Herdies, Dirceu Luís
Hodges, Kevin
Pontes da Silva, Bruce Francisco
Ambrizzi, Tercio

المصدر

Advances in Meteorology

العدد

المجلد 2015، العدد 2015 (31 ديسمبر/كانون الأول 2015)، ص ص. 1-20، 20ص.

الناشر

Hindawi Publishing Corporation

تاريخ النشر

2015-06-09

دولة النشر

مصر

عدد الصفحات

20

التخصصات الرئيسية

الفيزياء

الملخص EN

This paper aims to identify the circulation associated with Easterly Wave Disturbances (EWDs) that propagate toward the Eastern Northeast Brazil (ENEB) and their impact on the rainfall over ENEB during 2006 and 2007 rainy seasons (April–July).

The EWDs identification and trajectory are analyzed using an automatic tracking technique (TracKH).

The EWDs circulation patterns and their main features were obtained using the composite technique.

To evaluate the TracKH efficiency, a validation was done by comparing the EWDs number tracked against observed cases obtained from an observational analysis.

The mean characteristics of EWDs are 5.5-day period, propagation speed of ~9.5 m·s−1, and a 4500 km wavelength.

A synoptic analysis shows that between days −2 d and 0 d, the low level winds presented cyclonic relative vorticity and convergence anomalies both in 2006 and 2007.

The EWDs signals are strongest at low levels.

The EWDs propagation is associated with relative humidity and precipitation positive anomalies and OLR and omega negative anomalies.

The EWDs tracks are seen over all ENEB and their lysis occurs between the ENEB and marginally inside the continent.

The tracking captured 71% of EWDs in all periods, indicating that an objective analysis is a promising method for EWDs detection.

نمط استشهاد جمعية علماء النفس الأمريكية (APA)

Gomes, Helber Barros& Ambrizzi, Tercio& Herdies, Dirceu Luís& Hodges, Kevin& Pontes da Silva, Bruce Francisco. 2015. Easterly Wave Disturbances over Northeast Brazil: An Observational Analysis. Advances in Meteorology،Vol. 2015, no. 2015, pp.1-20.
https://search.emarefa.net/detail/BIM-1052671

نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)

Gomes, Helber Barros…[et al.]. Easterly Wave Disturbances over Northeast Brazil: An Observational Analysis. Advances in Meteorology No. 2015 (2015), pp.1-20.
https://search.emarefa.net/detail/BIM-1052671

نمط استشهاد الجمعية الطبية الأمريكية (AMA)

Gomes, Helber Barros& Ambrizzi, Tercio& Herdies, Dirceu Luís& Hodges, Kevin& Pontes da Silva, Bruce Francisco. Easterly Wave Disturbances over Northeast Brazil: An Observational Analysis. Advances in Meteorology. 2015. Vol. 2015, no. 2015, pp.1-20.
https://search.emarefa.net/detail/BIM-1052671

نوع البيانات

مقالات

لغة النص

الإنجليزية

الملاحظات

Includes bibliographical references

رقم السجل

BIM-1052671