Resolving surface currents and heat advection with the global drifter array
This presentation is the property of its rightful owner.
Sponsored Links
1 / 27

Resolving Surface Currents and Heat Advection with the Global Drifter Array PowerPoint PPT Presentation


  • 49 Views
  • Uploaded on
  • Presentation posted in: General

Resolving Surface Currents and Heat Advection with the Global Drifter Array. Rick Lumpkin. Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration. NOAA Climate Observation Program 3 rd Annual System Review April 25-27, 2005.

Download Presentation

Resolving Surface Currents and Heat Advection with the Global Drifter Array

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Resolving surface currents and heat advection with the global drifter array

Resolving Surface Currents and Heat Advection with the Global Drifter Array

Rick Lumpkin

Atlantic Oceanographic and Meteorological Laboratory,

National Oceanic and Atmospheric Administration

NOAA Climate Observation Program

3rd Annual System Review

April 25-27, 2005


1 what we can resolve

1. What we can resolve


Time mean currents

75% of 1°1°bins!

Time-mean currents


Seasonal variations of sst

Seasonal variations of SST


Differences with satellite sst products

Differences with satellite SST products


Differences with satellite sst products1

Differences with satellite SST products


Mean heat advection

Mean heat advection

SST gradient (°C per degree)

Mean heat advection, upper 30m (W/m2)


Advection of sst anomalies

Advection of SST anomalies

W/m2

Anomalous heat advection, upper 30m (W/m2)


Surface current anomalies

378 drogued

Surface current anomalies


2 what we aren t resolving

2. What we aren’t resolving

(Drifters alone: any process happening in data gaps)


Eddy fluxes and anomalous advection of mean sst

Eddy fluxes and anomalous advection of mean SST


Evaluating the drifter array

Evaluating the drifter array

SST: GOOS evaluated by NOAA/NCDC

SURFACE CURRENTS

Accuracy: 2 cm/s

Resolution: 600 km

Number of measurements per month: 1

From Needler et al. 1999: Action plan for GOOS/GCOS and Sustained Observations for CLIVAR.


Evaluating the drifter array1

Evaluating the drifter array


Before and after

Before and after


3 how can we improve

3. How can we improve?


Predicting the array

Predicting the array


Predicting the array1

Predicting the array


Include information from other measurements altimetry winds

Include information from other measurements (altimetry, winds)


Oscar

170ºE-130ºW, 10ºS-10ºN

OSCAR

Pilot project for a NOAA/NESDIS Operational Surface Current Processing and Data Center

(F. Bonjean, J. Gunn, G. Lagerloef, E. Johnson)


Aviso

AVISO Altimetry product

Collecte Localisation Satellites (CLS)

Topex/Poseidon, Jason-1, ERS-1 and ERS-2

Aviso


Resolving surface currents and heat advection with the global drifter array

U(t)=U + A u’(t)

Absolute speed (m/s)

Drifters+wind, altimetry

altimeter

(methodology of Niiler et al., 2003)


Large rossby number flow

L

pg

Coriolis

centrifugal

H

Cor

pg

centrifugal

H

L

large Rossby number flow

(centrifugal) (Coriolis) (Pressure gradient)

If we ignore centrifugal

(assume geostrophy), we:

Underestimate Coriolis

(underestimate v)

Overestimate Coriolis

(overestimate v)


Drifters calibrating satellite ssv

1 0.5 0

Drifters: calibrating satellite SSV


Drifters in situ calibration to reduce global bias in satellite ssv

Drifters: in-situ calibration to reduce global bias in satellite SSV

R. Lumpkin and G. Goni, NOAA/AOML


Summary global drifter array

Summary: Global Drifter Array

  • What we can resolve:

    • <U>, <SST>, <U>·<SST>,

    • U(x,t) where coverage is sufficient

    • mean eddy statistics

    • Drifter SST(x, t): cal/val of satellite products

    •  <U>· SST’

  • What we can’t resolve:

    • Anything in the “data holes”

    • U(x,t) at sufficient resolution for time series

    • of eddy fluxes

  • What we can do about this:

    • Plan ahead: anticipate gaps

    • Synthesize drifters, winds and altimetry for

      • operational surface currents

    • Drifter U(x,t) cal/val of satellite products

[email protected]


Resolving surface currents and heat advection with the global drifter array

fin


Terms in nino3 region

Terms in NINO3 region


  • Login