The record high heat content of
the Western Pacific over the past few years has led to the direct development of several super-typhoons.
The process begins when strong convective activity over equatorial East Asia and subsiding cool air off South America's west coast creates a wind pattern which pushes Pacific water westward and piles it up in
the western Pacific.
What we definitely see is a cooling over Southern Asia, together with a sluggish warming of
the Western Pacific.
In the Equatorial Pacific, we normally have equatorial upwelling in the east and downwelling in the west, aka
the Western Pacific Warm Pool.
Under ordinary circumstances,
the western Pacific waters are warm, and the eastern waters are cool.
If convective activity slows in
the Western Pacific for some reason (this reason is not currently known), the climates of areas adjacent to
the Western Pacific are affected.
This Walker circulation is due to the SST difference: about 8 °C cooler in the eastern Pacific than
the western Pacific.
«It is important to recognize that this work does not explain rainfall's regional features, such as for example the contrast between
the western Pacific Ocean and the eastern Pacific, nor does it say anything about whether more rainfall will fall over land or over ocean,» Fasullo told mongabay.com.
http://www.sciencedaily.com/releases/2014/02/140202111055.htm «The satellite observations have shown that warming of the tropical Indian Ocean and tropical
Western Pacific Ocean — with resulting increased precipitation and water vapor there — causes the opposite effect of cooling in the TTL region above the warming sea surface.
«A Climatology of Surface Cloud Radiative Effects at the ARM Tropical
Western Pacific Sites.»
Data from past field campaign deployments and the deactivated Tropical
Western Pacific site are accessible through Data Discovery.
There is no great pool of warn water in
the western Pacific.
La Nina increases rainfall in
the western Pacific, Africa, China, the Mediterranean, etc..
This year it is causing big typhoons in
the western pacific and wildfires in Australia.
In summary, we showed that the spring temperature anomalies over the WAIS are significantly correlated with sea ice in the ABS, with temperature anomalies at Faraday / Vernadsky, with geopotential height anomalies in the South Pacific, and with SSTs in the southern tropical
western Pacific (Table 4).
So the IO lags
the Western Pacific by roughly 7.5 years, but the lag is irregular.
The western Pacific is subject to a seasonal climatic regime that replaces the planetary system.
Who would of thought that tidal variations in
the western Pacific could possibly be related to ENSO?
The spreading out of some water north and south in
the Western Pacific is not part of ENSO but of the North and South Pacific gyres.
What makes ENSO possible is the blockage of the equatorial currents in
the Western Pacific that allows the Indo - Pacific Warm Pool to form that is the source of the El Nino wave.
A new Indonesian coral - based record of surface ocean salinity shows that the location of the most significant hydroclimatic feature in the Southern Hemisphere, the South Pacific Convergence Zone (SPCZ), a band of high clouds and precipitation, influences a major current in the far
western Pacific Ocean.
For example, floods in Ecuador, Peru and southwest American, but drought in Indonesia and other
western Pacific countries.»
In addition, some of the warm surface water in
the Western Pacific moves back out east.
During the 1997/98 El Nino, the warm water contained in
the Western Pacific Warm Pool sloshed east and spread across the surface of the central and eastern tropical Pacific.
Question — how many of those American warships which returned the anomalous temperature readings during the war years were based in
the western Pacific?
When that warm water reaches
the western Pacific it rises and, in the main, tracks back along the equator in the upper atmosphere and loses its heat to space.
Basically, the warm water that was built up during the 1995/96 La Nina collected below the surface of an area in the western tropical Pacific known as
the Western Pacific Warm Pool (to depths of 300 meters).
Then, as the La Nina of 1998/99/00 / 01 progressed, the trade winds, Pacific Equatorial Currents, and a phenomenon known as a Rossby wave returned the remaining surface and subsurface warm water to
the western Pacific.
The warm water and energy nearly spill right out of the IPWP as the thermocline in
the western Pacific rises.
While we can not assert with confidence whether this ongoing shift is part of natural ENSO variability or a manifestation of GHG - induced climate change [68], this increase in variance coincides with rising temperatures in
the Western Pacific Warm Pool [23,69 — 71].
Dayem, KE; Noone, DC; Molnar, P (2007), Tropical
western Pacific warm pool and maritime continent precipitation rates and their contrasting relationships with the Walker Circulation.
Water vapour rises in
the western Pacific creating low pressure cells that strengthen the trade winds piling up yet more warm water in
the western Pacific.
Extraordinarily strong storms seem to be occurring more in recent years not only in
the western Pacific but also in the eastern part of that ocean, Lin noted.
Typhoon Meranti blasted
the western Pacific in 2016, wreaking havoc in the Philippines, Taiwan, and mainland China, leaving dozens dead or missing and doing billions of dollars» worth of damage.
El Niño, accompanies high air surface pressure in
the western Pacific, while the cold phase, La Niña, accompanies low air surface pressure in
the western Pacific.
I've used JPL sea level animations to demonstrate equatorial Pacific Kelvin waves during El Niño events and the much overlooked Rossby waves that return vast amounts of warm water to
the western Pacific during La Niña events.
In fact simultaneously with the strengthening warming of the subsurface
western Pacific is an intensification of the cold subsurface tongue at the east Pacific (WUWT ENSO page).
Even though La Niña produces an overall cooling effect over the eastern Pacific, the associated strengthening of the subtropical high - pressure system and trade winds causes warm water to accumulate more in
the western Pacific.
During El Niño, warm water and high sea levels shift eastward, leaving in their wake low sea levels in
the western Pacific (see picture of exposed reefs in Guam).
When comparing summer SST fields for 2007 and 2008 one can see that there was a stronger positive anomaly in 2008's North -
Western Pacific SST and stronger negative one in 2007's North - Eastern Pacific SST.
A brief and simple explanation: Looking only at the tropical Pacific, a significant El Niño releases a vast amount of warm water from below the surface of
the Western Pacific Warm Pool and it sloshes east.
Now there is a tremendous amount of ocean heat accumulating in the 150 metre depths of
the western Pacific.
She said that long - term, decadal La Niña — like conditions are the likely reason for the increase in heat content fueling storms over
the western Pacific such as Haiyan and Meranti.
The Pacific Ocean may be primed by reduced solar activity to more eastern ocean upwelling of cold and nutrient rich water burping carbon dioxide back into the atmosphere — and what energy there was in
the western Pacific has dissipated off the eastern margin.
R. Gates: Furthermore, we know the energetic roots of this were in the warm waters of
the western Pacific.
We are on super typhoon 27 or 28 this year in
the Western Pacific.
Amazing to see energy that originated as warmth in
the Western Pacific cause a cold outbreak in the US.
In the evolution of ENSO — the energy once stored in
the western Pacific has dissipated and the next phase is inevitably recharge — in La Nina — of energy in the Pacific warm pool.
Furthermore, we know the energetic roots of this were in the warm waters of
the western Pacific.
«We use geochemical data from a sediment core in the shallow - silled and intermittently dysoxic Kau Bay in Halmahera (Indonesia, lat 1 ° N, long 127.5 ° E) to reconstruct century - scale climate variability within
the Western Pacific Warm Pool over the past ~ 3500 yr.