Directly to content
  1. Publishing |
  2. Search |
  3. Browse |
  4. Recent items rss |
  5. Open Access |
  6. Jur. Issues |
  7. DeutschClear Cookie - decide language by browser settings

A comprehensive global 3D model of delta-18O in atmospheric CO2

Cuntz, Matthias

German Title: Ein konsistentes globales 3D Modell des delta-18O im atmosphärischen CO2

[thumbnail of cuntz_matthias_dissertation_2002_to_faculty.pdf]
Preview
PDF, English
Download (2MB) | Terms of use

Citation of documents: Please do not cite the URL that is displayed in your browser location input, instead use the DOI, URN or the persistent URL below, as we can guarantee their long-time accessibility.

Translation of abstract (English)

I have built the first comprehensive global 3D model to simulate delta-18O in atmospheric CO2. The aim is to disentangle this isotope signal which offers the potential to determine the CO2 gross fluxes of the terrestrial biosphere. Model surface processes have been validated against regional experiments while the integrated atmospheric signal has been investigated comparing with global atmospheric observations. Modelled surface processes compare well with observed data over the whole latitude range except for high northern latitudes where the experimental data are very sparse. The water isotopes of rain are well reproduced but the soil signal is too attenuated in the model. The model further simulates very well the seasonal cycle of atmospheric CO2. For delta-18O(CO2), it precedes the measured cycle by two month. This discrepancy could not be resolved with our current knowledge of delta-18O(CO2). The modelled amplitude is very sensitive to different parameterisations, standard values result in only 2/3 of the observed amplitude. Concerning the meridional gradient in delta-18O(CO2), I could show that about one half of the signal comes from the covariance of delta-18O(CO2) sources with atmospheric transport and the other half from the imbalance of delta-18O(CO2) isofluxes between the northern and southern hemisphere.

Document type: Dissertation
Supervisor: Levin, Priv.-Doz Ingeborg
Date of thesis defense: 20 November 2002
Date Deposited: 25 Nov 2002 00:00
Date: 2002
Faculties / Institutes: The Faculty of Physics and Astronomy > Institute of Environmental Physics
DDC-classification: 530 Physics
Controlled Keywords: Kohlendioxid, Kohlenstoffkreislauf, Sauerstoff-18, Modellierung, Globale Analysis
Uncontrolled Keywords: Globale Modellierung , Diskriminierung , CO2 , delta-18Ocarbon dioxide , oxygen-18 , global modelling , discrimination , delta-18O , carbon cycle
About | FAQ | Contact | Imprint |
OA-LogoDINI certificate 2013Logo der Open-Archives-Initiative