| Journal: | Revista brasileira de geofisica |
| Database: | PERIÓDICA |
| System number: | 000340304 |
| ISSN: | 0102-261X |
| Authors: | Kane, Rajaram Purushottam1 |
| Institutions: | 1Instituto Nacional de Pesquisas Espaciais, Sao Jose dos Campos, Sao Paulo. Brasil |
| Year: | 2008 |
| Season: | Abr-Jun |
| Volumen: | 26 |
| Number: | 2 |
| Pages: | 227-236 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico, descriptivo |
| English abstract | A study of the Outgoing longwave radiation (OLR) values (Unit, W/m2) observed by various satellites during 1979-2002 revealed that the OLR values varied considerably from one geographical region to another (∼100-300 units). The climatology was latitude dependent. At middle and high latitudes, the range (minimum to maximum) was ∼40-60 units, with maximum in local summer and minimum in local winter, but at lower latitudes, the range reduced considerably and was uncertain near equator. Near equator, the long-term changes (as seen in 12-month moving averages) were: OLR decreases during ENSO events in the eastern Pacific up to the dateline, and OLR increases during ENSO events in the Australasian region. Outside the equatorial region, the OLR changes were small during ENSO events and negligible in other years. In some longitudes at middle and high latitudes, the OLR changes occurred several months after the El Ni no events, coinciding with La Nina (cold water events, opposite of warm water El Nino events) |
| Portuguese abstract | Um estudo dos valores (em unidades de W/m2) da emissao de radiacao de ondas longas (OLR) observados por sensores em varios satelites entre 1979 e 2002 revelou que os valores de OLR variavam consideravelmente de uma regiao geografica para outra (∼100-300 unidades). A climatologia era dependente da latitude. Em latitudes medias e altas, a faixa de variacao (mınima e maxima) era de ∼40-60 unidades, com valores maximos no verao local e mınimos no inverno, porem, em baixas latitudes, a faixa se tornava consideravelmente reduzida e oscilante proximo do equador. Neste caso, as mudancas de longo termo (como observado em m´edias moveis de 12 meses) eram: os valores de OLR decresciam ate o dateline durante os eventos ENSO do Pacıfico oriental e aumentavam durante os eventos ENSO na regiao da Australia. Fora da regiao equatorial, as mudancas do OLR eram pequenas durante os eventos ENSO e insignificante nos outros anos. Em algumas longitudes, em latitudes medias e altas, as mudancas OLR ocorreram em diversos meses apos os eventos El Nino, coincidindo com La Nina (eventos de aguas frias, opostos aos de aguas quentes dos eventos El Nino) |
| Disciplines: | Geociencias |
| Keyword: | Geofísica, Oceanografía, Radiación de onda larga, Espectro, El Niño, La Niña |
| Keyword: | Earth sciences, Geophysics, Oceanography, Longwave radiation, Spectra, El Niño, La Niña |
| Full text: | Texto completo (Ver PDF) |
