scholarly journals Variations in Western Pacific Warm Pool surface and thermocline conditions over the past 110,000 years: Forcing mechanisms and implications for the glacial Walker circulation

2018 ◽  
Vol 201 ◽  
pp. 429-445 ◽  
Author(s):  
Martina Hollstein ◽  
Mahyar Mohtadi ◽  
Yair Rosenthal ◽  
Matthias Prange ◽  
Delia W. Oppo ◽  
...  
Keyword(s):  
Walker Circulation ◽  
Warm Pool ◽  
Western Pacific ◽  
Western Pacific Warm Pool ◽  
The Past ◽  
Pool Surface ◽  
Pacific Warm Pool ◽  
Forcing Mechanisms

scholarly journals The influence of radiation flux in Northwest Pacific on the Western Pacific warm pools and typhoons over the past 170 years

2021 ◽  
Author(s):  
Chai Boyu ◽  
Feng Xu ◽  
Jianjun Xu ◽  
Han Li-guo ◽  
CHEN Si-qi ◽  
...  
Keyword(s):  
Radiation Flux ◽  
Longwave Radiation ◽  
Warm Pool ◽  
Western Pacific ◽  
Shortwave Radiation ◽  
Northwest Pacific ◽  
Western Pacific Warm Pool ◽  
The Past ◽  
Pacific Warm Pool ◽  
The Western Pacific

Abstract Based on various statistical methods and empirical orthogonal function (EOF) analysis, this study analyzes the correlation of radiation flux of Northwest Pacific in the 100 years scale with the western Pacific warm pool and typhoon development. The key results are as follows. First, the surface downwelling longwave radiation (SDLR) received by key areas in Northwest Pacific significantly increased over the past 170 years. The surface downwelling shortwave radiation (SDSR) decreased, and TOA (Top of Atmosphere) incident shortwave radiation (TISR) slightly fluctuated and increased in the 11a (11 years) period. Second, there was the strongest correlation between the Western Pacific warm pool and SDLR, and both increased continuously. Third, since 1945, there has been a tendency of increasing after decreasing in the annual frequency and the share of severe typhoons, and the formation area distribution of typhoons has turned more even. Taking 1998 as a cut-off point, before 1998, there was no obvious correlation between the strong typhoon frequency and SDLR. However, such correction became stronger after 1998. They were affected by the changes of SDLR, SDSR, TISR, vapor, vorticity, vertical velocity, SST and h100 . Forth, the SDLR and TISR are major factors influencing the Western Pacific warm pool, typhoon motion and other varieties. While SDLR mainly increases in the tropical areas, TISR tends to fluctuate and increase slightly. Their changes are consistent with the change general characteristics of strengthening of typhoon.

The precession phase of hydrological variability in the Western Pacific Warm Pool during the past 400 ka

2011 ◽  
Vol 30 (25-26) ◽  
pp. 3716-3727 ◽  
Author(s):  
Kazuyo Tachikawa ◽  
Olivier Cartapanis ◽  
Laurence Vidal ◽  
Luc Beaufort ◽  
Tatiana Barlyaeva ◽  
...  
Keyword(s):  
Warm Pool ◽  
Western Pacific ◽  
Western Pacific Warm Pool ◽  
The Past ◽  
Hydrological Variability ◽  
Pacific Warm Pool ◽  
The Western Pacific

Stable sea surface temperatures in the western Pacific warm pool over the past 1.75 million years

Nature ◽  
2005 ◽  
Vol 433 (7023) ◽  
pp. 294-298 ◽  
Author(s):  
Thibault de Garidel-Thoron ◽  
Yair Rosenthal ◽  
Franck Bassinot ◽  
Luc Beaufort
Keyword(s):  
Warm Pool ◽  
Western Pacific ◽  
Sea Surface ◽  
Western Pacific Warm Pool ◽  
Sea Surface Temperatures ◽  
The Past ◽  
Surface Temperatures ◽  
Pacific Warm Pool ◽  
The Western Pacific

scholarly journals KETERKAITAN PERUBAHAN IKLIM PADA GLASIAL AKHIR - HOLOSEN TERHADAP TINGKAT KEANEKARAGAMAN FORAMINIFERA DI LAUT HALMAHERA

2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Fitria Ratna Pratiwi ◽  
Suwarno Hadisusanto ◽  
Luli Gustiantini ◽  
Nazar Nurdin ◽  
Mira Yosi
Keyword(s):  
Younger Dryas ◽  
Warm Pool ◽  
Western Pacific ◽  
Western Pacific Warm Pool ◽  
Pacific Warm Pool

Laut Halmahera terletak pada Western Pacific Warm Pool (WPWP), yaitu pusat konveksi panas di Samudera Pasifik Barat tropis. Laut ini merupakan salah satu jalur masuk Arlindo yang menghubungkan massa air Samudera Pasifik dengan Samudera Hindia. Sehingga area ini penting untuk rekonstruksi paleoklimat. Peristiwa perubahan glasial akhir-interglasial (Holosen) merupakan peristiwa di masa lalu yang sangat mempengaruhi kondisi Laut Halmahera. Salah satu proksi yang dapat digunakan untuk mencatat perubahan iklim di masa lalu adalah sisa-sisa makhluk hidup, termasuk foraminifera. Perubahan yang terjadi pada foraminifera dapat diamati dari tingkat  keanekaragaman, kemelimpahan, dominansi, dan keseragaman. Penelitian dilakukan dengan menggunakan sampel sedimen bor MD10-3339, yang diambil di Laut Halmahera (00o26,67’LS dan 128o50,33’BT) pada kedalaman 1.919 m, dalam survei MONOCIR 2 tahun 2010. Sampel yang digunakan pada rentang 20 cm hingga 1.930 cm dengan interval 60 cm pada tiap sampel, yang dianggap mewakili waktu terjadinya glasial-interglasial. 30 sampel kemudian diamati dan dilakukan analisis secara kuantitatif. Teridentifikasi 52 spesies yang terdiri dari 32 spesies foraminifera bentonik dan 21 spesies foraminifera planktonik. Nilai indeks keanekaragaman, nilai indeks keseragaman, dan indeks dominansi menunjukkan nilai yang fluktuatif sejak glasial-interglasial, dengan nilai rata-rata 1,66; 0,35; dan 0,3. Walaupun tidak menunjukkan pola glasial-interglasial, namun pada sekitar umur 12.519 BP, nilai indeks keanekaragaman dan nilai keseragaman menunjukkan nilai yang lebih rendah dibandingkan dengan nilai yang lain yaitu 1,102 dan 0,26. Sebaliknya, indeks dominansi mencapai nilai tertinggi yaitu 0,55.  Selain itu, persentase P. obliqueloculata pada umur ini menjadi sangat dominan yaitu 73,05%. Hal tersebut kemungkinan berkaitan dengan peristiwa Younger Dryas.

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