Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.sevin.ru/seminars/argos2/04_20100204_oc.pdf Дата изменения: Mon Feb 8 12:50:00 2010 Дата индексирования: Tue Oct 2 17:24:19 2012 Кодировка:

Page 1

Ocean Color Workshop IPEE/CLS - 3-FEB-2010


Satellite characteristics
Page 2

Satellite AQUA
American satellite (NASA) Operational mission Orbit = 705 km 14/15 rotations/day almost polar heliosynchroneous European satellite (ESA) Operational mission Orbit = 800 km ~12 rotations/day polar heliosynchroneous

Instrument - radiometer Modis - passive measurement - sensible in visible band and infrared Meris - spatial resolution: 1 x 1 km. - gaps due to clouds

Envisat


Radiometer measurements
Page 3

Diffusion, reflextion and absoprtion by air particles and aerosols

sensor Ascending light

Descending light from sun

Absorption

Reflection at sea surface

Chlorophyll-A contain photo synthetics pigments . They reflect a wave length that is measured by MODIS/MERIS sensors

Absorption, diffusion et reflection by phytoplancton and other particles

Reflection of the light in the first few meters below the sea surface


Radiometer measurements
Page 4

· Sensor = instrument that measure radiation emitted by the sea surface but also the first few meters below the surface · Satellite transmits data when it flies over a reception antenna · Data are sent to CLS to be processed · Maps are generated by in built algortihm in CLS · Final map: resolution (pixel) = 0.04 X 0.04° (4 km) · Maximum time delivery between acquisition and CLS end processing = 4-5 hours


OC characteristics
Page 5

· OC maps are synoptic views of the ocean surface:
­ That depict the chlorophyll concentration ­ Directed linked to
· The phytoplankton distribution · The zooplankton concentration · The feeding of fishes

· OC maps provide information on:
­ Oceanic circulation ­ Dynamic characteristics of the ocean (oceanic fronts, upwelling, cold eddies...) ­ Favorable areas of primary production


Global coverage
Page 6


Ocean color maps and animals
Page 7

Low concentration

High concentration

Phytoplakton concentration is high in brown Fish and marine mammals are migrating toward these areas to feed


Correlation SLA/OC
Page 8


CLS data processing
Page 9


CLS data processing
Page 10


Satellite

Satellite observations
Page 11

Gulf of Mexico:
To delineate the Loop current To localize and monitor eddies

Angola:
To detect and monitor plume river

Trinidad:
To track eddies

Ocean colour data make it possible to trace and predict the motions of water masses from space.


The context of SST and OC use at CLS
12