V10

Question 1

Biogeoscience:

Answer 1

Question 2

Land-atmosphere interactions:

Answer 2

Question 3

Terrestrial biogeosciences:

Answer 3

Question 4

Biogeowissenschaften:

Answer 4

Question 5

Interactions:

Biogeochemical feedback processes

Answer 5

Question 6

Interactions:

Biogeochemical feedback processes

Answer 6

Question 7

Interactions:

Biogeophysical feedback processes

Answer 7

Question 8

Global carbon cycle:

Answer 8

Question 9

Global carbon cycle:

Answer 9

Question 10

Global forest carbon budget:

Answer 10

Question 11

Climate services by ecosystems:

Answer 11

Question 12

Effects of afforestation:

Answer 12

Question 13

CO2-Aufnahme durch Pflanzen:

Answer 13

Question 14

Blattoberfläche:

Answer 14

Question 15

Carbon balance of plants:

Answer 15

Question 16

CO2 mixing ratios in forests:

Answer 16

Question 17

Carbon balance of forests:

Answer 17

Question 18

Carbon fluxes of forests:

Answer 18

Question 19

Net primary production:

Answer 19

Question 20

Effects of stress:

Answer 20

Question 21

Excursus:

Methane and nitrous oxide

Answer 21

Question 22

Current project:

Carbon fluxes of an urban forest in Moscow

Why?

Answer 22

• 70% of the global GHG emissions from urban areas ⇒ also climate mitigation needs to be strongly addressed in urban areas
• Among the many positive ecosystem services provided by urban forests, the uptake of CO2 is a very important one
• However, there is not a good understanding of the sink strength of such urban forests considering different ecosystems, climate zones, multiple (urban) stressors and many other variables
• Main objective: Quantification of the net ecosystem exchange of an urban forest for a better assessment of its carbon sink strength

Question 23

Current project:

Carbon fluxes of an urban forest in Moscow

Instrumentation

Answer 23

• Eddy-Covariance system for determination of CO2 and H2O fluxes
• Ultrasonic 3D anemometer (omnidirectional)
• IRGA for CO2 and water vapor
• Mounted on top of a ~35m tall tower

Question 24

Current project:

Carbon fluxes of an urban forest in Moscow

Results

Answer 24

Question 25

Current project:

Carbon fluxes of an urban forest in Moscow

Conclusions

Answer 25

• Footprint of the urban forest was a CO2 source in almost every month & wind direction
• Weekday analysis shows a clear effect of anthropogenic influence on the fluxes
• Possible reasons:
  
  • True footprint includes streets & buildings?
  • Soil emissions?
  • Stressed ecosystem?
  • Parameters for processing optimized?
  • Systematic errors?

Question 26

Carbon fluxes:

Answer 26