Semester WorkSemester Work

B94209025 B94209025 馮培寧馮培寧 Kirsten FengKirsten Feng

Paper ReviewPaper Review

Paper ReviewPaper Review

North Atlantic OscillationNorth Atlantic Oscillation Tropical Pacific ClimateTropical Pacific Climate Abrupt increase of winter rainfalls over the northAbrupt increase of winter rainfalls over the north

ern Taiwan and the weakening of the East Asian ern Taiwan and the weakening of the East Asian winter monsoon in the early 1980swinter monsoon in the early 1980s

Influence of the Antarctic Circumpolar Wave on Influence of the Antarctic Circumpolar Wave on El Niño and its multidecadal changes from 1950 El Niño and its multidecadal changes from 1950 to 2001 (not yet finished…)to 2001 (not yet finished…)

Still another 5 …Still another 5 …

NAO and Tropical Pacific ClimateNAO and Tropical Pacific Climate

MPI-OM and KCM modelMPI-OM and KCM modelBoth of them are without flux adjustmentBoth of them are without flux adjustmentKCM solutions are compared with the real KCM solutions are compared with the real

observation data—observation data—Some area are higher but some are weakerSome area are higher but some are weaker

There are still rooms to improveThere are still rooms to improve

Abrupt Increase RainfallsAbrupt Increase Rainfalls

In the early 1980s, the East Asian winter In the early 1980s, the East Asian winter monsoon weakened but the rainfalls in monsoon weakened but the rainfalls in northern Taiwan has abrupt increase in northern Taiwan has abrupt increase in that epoch.that epoch.

The phenomenon happened only in The phenomenon happened only in northern Taiwan and southern China.northern Taiwan and southern China.

In that epoch, winter precipitations in In that epoch, winter precipitations in Japanese coast and Philippines also Japanese coast and Philippines also decreased with the weak monsoon.decreased with the weak monsoon.

Abrupt Increase RainfallsAbrupt Increase Rainfalls

This anomaly data was divided into two This anomaly data was divided into two parts for frontal effect or not.parts for frontal effect or not.

The northward flow made the frontal rain The northward flow made the frontal rain band complete and strong, which caused band complete and strong, which caused the abrupt rainfalls in the early 1980s.the abrupt rainfalls in the early 1980s.

If we want to study the abnormal strong If we want to study the abnormal strong current further, PDO may be a possible current further, PDO may be a possible way. way.

A conceptual model explain the rainfall brought A conceptual model explain the rainfall brought by the eastward moving fronts produce more by the eastward moving fronts produce more rainfalls to the southern China and plains over rainfalls to the southern China and plains over the northern Taiwan.the northern Taiwan.

It’s considered that NAO is related to the It’s considered that NAO is related to the variance of precipitations in northern Taiwan.variance of precipitations in northern Taiwan.

The latter studiesThe latter studies

Some AbbreviationsSome Abbreviations

Antarctic Circumpolar Wave = ACWAntarctic Circumpolar Wave = ACW sea level pressure = SLPsea level pressure = SLP sea ice extent = SIEsea ice extent = SIE global ENSO wave = GEWglobal ENSO wave = GEW Antarctic circumpolar current = ACCAntarctic circumpolar current = ACC

Global ENSO WaveGlobal ENSO Wave

The global traveling wave of ENSO propagThe global traveling wave of ENSO propagates slowly eastward around the tropical glates slowly eastward around the tropical global ocean as a coupled SST/SLP wave, cobal ocean as a coupled SST/SLP wave, composed of global zonal wave numbers 1 omposed of global zonal wave numbers 1 and2, with phase speeds ranging from 45 tand2, with phase speeds ranging from 45 to 90 of longitude per year, taking 4 to 8 yeo 90 of longitude per year, taking 4 to 8 years to circle the globe.ars to circle the globe.

Antarctic Circumpolar WaveAntarctic Circumpolar Wave

The ACW in the Indian sector of the southern oThe ACW in the Indian sector of the southern ocean spawns a coupled SST/SLP wave that hacean spawns a coupled SST/SLP wave that has been observed propagating equatorward into s been observed propagating equatorward into the tropical Indian ocean. the tropical Indian ocean.

The latter oceanic teleconnection provides a pThe latter oceanic teleconnection provides a positive feedback to the GEW in the Warm Pool ositive feedback to the GEW in the Warm Pool north of Australia, producing a resonant interacnorth of Australia, producing a resonant interaction between the GEW and ACW that reinforcetion between the GEW and ACW that reinforces the amplitudes of both via a global feedback ls the amplitudes of both via a global feedback loop in the southern hemisphere that takes abooop in the southern hemisphere that takes about 4 years to complete.ut 4 years to complete.

Antarctic Circumpolar WaveAntarctic Circumpolar Wave

Ocean and atmospheric covariance, Ocean and atmospheric covariance, feedbacks.feedbacks.

The global waves and global standing The global waves and global standing modemode

By using the model we want to find if the By using the model we want to find if the pattern of global warming persists into pattern of global warming persists into the 21th century, then the ACW will the 21th century, then the ACW will continue to influence El Nino through the continue to influence El Nino through the South Indian Ocean.South Indian Ocean.

Plot Tools and SyntaxesPlot Tools and Syntaxes

Special Thanks To Special Thanks To 泉源 泉源 : ): )

Some “m_tools”Some “m_tools”

M_mapM_mapThe way we set projection methodThe way we set projection method

M_pcolorM_pcolorThe color bar and shadingThe color bar and shading

M_contourfM_contourfTo show the data and the valueTo show the data and the value

M_contourM_contourOnly the isobarsOnly the isobars

Some “m_tools”Some “m_tools”

M_coastM_coastTo set up the terrainsTo set up the terrains

Vector wind directionVector wind directionM_quiverM_quiverM_vecM_vec

Each syntax should be pose in the sequenEach syntax should be pose in the sequence for the correct terrain and value ce for the correct terrain and value

Seawater Tool BoxSeawater Tool Box

PressurePressureHeightHeight

Sw_gpan (S,T,P)Sw_gpan (S,T,P)So we have to set up pressure before thisSo we have to set up pressure before this

Prospect Prospect

The Future WorksThe Future Works

<<Low-frequency variability in the <<Low-frequency variability in the Southern Ocean region in a simplified Southern Ocean region in a simplified coupled model>>coupled model>>

<<Resonant excitation of the quasi-<<Resonant excitation of the quasi-decadal oscillation by the 11-year signal in decadal oscillation by the 11-year signal in the Sun's irradiance>> the Sun's irradiance>>

Friday <<ECHA 1000>>Friday <<ECHA 1000>>

Different LES applicationDifferent LES application

Structural and Concentrated GridStructural and Concentrated Grid

LES resolution by FLUENTLES resolution by FLUENT

It has the detailed resolution.It has the detailed resolution.

Thanks For Your Attention!Thanks For Your Attention!

Bon Vacance!Bon Vacance!