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Terrestrial biosphere and global change: the carbon cycle at the land surface . Han Dolman [ dola@geo.vu.nl ] Alterra Wageningen, NL. Top Down: atmospheric methods. The Dual constraint approach for carbon balances. Bottom up: forest inventories, models. The Global Carbon Cycle.

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Presentation Transcript
slide1

Terrestrial biosphere and

global change:

the carbon cycle at the land surface

Han Dolman

[dola@geo.vu.nl]

Alterra

Wageningen, NL

slide2

Top Down:

atmospheric methods

The Dual constraint approach

for carbon balances

Bottom up:

forest inventories,

models

the global carbon cycle
The Global Carbon Cycle

Atmosphere 750, + 3 per year

60

6.5

90

cement production

Fossil fuels &

Deforestation

& respiration

Terrestrial production

Oceanic exchange

1 -1.5

62 - 63

92

Terrestrial ecosystem

Surface ocean

Vegetation 610

1020

0.4

Soils

1400

Litter 60

92

40

50

100

_____________

Ocean

Marine biota

4

Total

2070

38,100

3

Fossil fuel reserves

6

0.2

6

4000

DOC

Sediment

700

Carbonate rocks

6

65x10

slide6

Brasil: LBA-EUSTACH Sites

Manaus K34 and

Manaus C14

Caxiuana

Rebio Jaru

Fazenda Nossa Senhora

slide8

CO2 eddy fluxes over 2 years in the Central and SouthernAmazon

Data are 10-day averages.

Missing data are green or dark blue

what is causing the variation in nee
What is causing the variation in NEE?

Length of growing season

Radiation load

landscape scale monitoring
Landscape scale monitoring

MmdC/dt+uMmdC/dx+vMmdC/dy = (Ci-Cm)/dt-Wi) I/m-A-R+MmdCf/dt

Free troposphere CO2

Weather

Flask sampling

Flux aircraft

Fossil fuel emission

Biospheric uptake

slide23

CarboEurope - Flux Monitoring Sites

  • 32 eddy correlation flux measurement towers
  • 8 sites with process studies
  • 5 with aircraft CO2 profiles
  • 7 chronosequences
  • In addition (not shown):
  • 10 stations of background atmospheric CO2 monitoring
  • plus 10 stations from
  • NOAA / CMDL