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World Ocean Heat Content, 1955-2000. Sydney Levitus Ocean Climate Laboratory National Oceanographic Data Center- NOAA First Argo Science Workshop November 14, 2003 Tokyo, Japan. OCL co-P.I.s on this work. John Antonov Tim Boyer Cathy Stephens OCL staff supporting WOD01 development

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world ocean heat content 1955 2000
World Ocean Heat Content, 1955-2000

Sydney Levitus

Ocean Climate Laboratory

National Oceanographic Data Center- NOAA

First Argo Science Workshop

November 14, 2003

Tokyo, Japan

ocl co p i s on this work
OCL co-P.I.s on this work

John Antonov

Tim Boyer

Cathy Stephens

OCL staff supporting WOD01 development

Olga Baranova Daphne Johnson

Margarita Conkright Ricardo Locarnini

Carla Forgy Todd O’ Brien

Hernan Garcia Igor Smolyar

Bob Gelfeld

outline
Outline
  • Data added since prior work
  • Review of prior work
  • New results and future work
slide5
OSD cast data acquired through the GODAR Project for 1900-1991 compared to NODC archive holdings as of 1991
world ocean climatological annual cycle of ocean heat content 10 22 j 0 500 m layer

World Ocean- Climatological annual cycle of ocean heat content 1022J (0-500 m layer)

S. Hem. range = 20

N. Hem. range = 13

World Ocean range = 10

slide10

Expected accuracy increase of world ocean heat content estimates due to Argo deployment (0-3000 m, 5-yeat estimates)

1 st eof of yearly content 0 1000 for 1956 2000 indo pacific

Based on analyses of data in WOD01

Fourier smoothing of yearly fields to eliminate phenomenon with periods < 10 years

EOF accounts for 23.1 % of variance

1st EOF of yearly content (0-1000) for 1956-2000 Indo-Pacific

1 st eof of yearly content 0 1000 for 1956 2000 atlantic
1st EOF of yearly content (0-1000) for 1956-2000 Atlantic

Based on analyses of data in WOD01

Fourier smoothing of yearly fields to eliminate phenomenon with periods < 10 years

EOF accounts for 33.4 % of variance: Correlation matrix

location of all profiles osd mbt xbt ctd mrb uor pfl apb drb in wod01 for year 2000 93 424 profiles

Location of all profiles (OSD+MBT+XBT+CTD+MRB+UOR+PFL+APB+DRB) in WOD01 for year 2000 (93, 424 profiles)

NODC/OCL 10/30/03

slide16
World Ocean- Linear trend (1956-2000) of zonally integrated ocean heat content (1020 J) (100 m thick layers)

Latitude

what will argo measure in the immediate future
What will Argo measure in the immediate future?

The parameters of state

temperature, salinity, and pressure

as a function of depth.

Thus Argo will provide a “Minimum Ocean

Observing System” (MOOS).

MOOS/GOOS

rossby 1959 2
Rossby (1959) (2)

“The assumption that our planet as a whole stands in firm radiation balance with outer space cannot be accepted without reservations, even if periods of several decades are taken into account.”

“Anomalies in heat probably can be stored and temporarily isolated in the sea and after periods of the order of a few decades to a few centuries again influence the heat and water vapour exchange with the atmosphere.”

rossby 1959 1
Rossby (1959) (1)

“The role of the sea as a secular heat reservoir assumes quite a different character at the moment that one takes up the question of secular changes of the total heat balance, taking into account the circulation of the deeper layers. An elementary calculation gives the result that even as much as 1 % of the total incoming heat radiation could be stored in a layer of 1000 m thickness in the interior of the sea, without producing a temperature increase greater than 0.015°C per year.”

future work
Future work
  • Describe spatial and temporal characteristics of ocean warming;
  • 2) Perform diagnostic studies, e.g., earth’s heat balance;
  • 3) Add “new” historical ocean profile data to reduce uncertainty,
    • e.g., there are probably data for:
    • 1 million Ocean Station Data casts and
    • 0.5 million bathythermographs
    • still in manuscript form or simply not yet available.
temperature difference c at 1750 m depth of the n atlantic
Temperature difference (°C) at 1750 m depth of the N. Atlantic

(1970-74)-(1955-59)

(1988-92)-(1970-74)

heat storage w m 2 for the north atlantic for 1988 92 1970 74
Heat storage (W m-2) for the North Atlantic for (1988-92) – (1970-74)

0-300 m depth

0-3000 m depth

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