Sökning: "Earth-System Model"

Visar resultat 1 - 5 av 28 avhandlingar innehållade orden Earth-System Model.

1. 1. Introducing Surface Gravity Waves into Earth System Models

   Författare :Lichuan Wu; Anna Rutgersson; Erik Sahlée; Peter Janssen; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Surface gravity waves; Air-sea interaction; Earth-System Model; Atmospheric mixing; Upper-ocean turbulence; Meteorologi; Meteorology;

   Sammanfattning : Surface gravity waves alter the turbulence of the bottom atmosphere and the upper ocean. Accordingly, they can affect momentum flux, heat fluxes, gas exchange and atmospheric mixing. However, in most state-of-the-art Earth System Models (ESMs), surface wave influences are not fully considered or even included. LÄS MER

3. 2. Land-atmosphere interactions and regional Earth system dynamics due to natural and anthropogenic vegetation changes

   Författare :Minchao Wu; MERGE: ModElling the Regional and Global Earth system; []
   Nyckelord :land-atmosphere interactions; RCA-GUESS; LPJ-GUESS; Vegetation dynamics; Fire;

   Sammanfattning : Observation and modelling studies have indicated that the global land surfaces have been undergoing significant changes in the past few decades, driven by both natural and anthropogenic factors, such as changes in ecosystem productivity, fire and land use. Land surface changes can potentially influence local and regional climate through land-atmosphere interactions. LÄS MER

4. 3. The Role of Vegetation-Climate Feedbacks in Regional Earth System Dynamics

   Författare :Anna Wramneby; Institutionen för naturgeografi och ekosystemvetenskap; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : The hypothesis of this thesis is that climate models should take structural vegetation changes that operate on interannual to centennial time scales into account in order to simulate climate change in a more realistic manner. To evaluate this hypothesis, a regional Earth System Model (ESM) has been developed, validated and applied over Europe. LÄS MER

5. 4. Entering the dynamic risk space : Assessing planetary boundary interactions through process-based quantifications

   Författare :Arne Tobian; Johan Rockström; Sarah Cornell; Ingo Fetzer; Dieter Gerten; Martin Volk; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Planetary boundaries; climate change; land-use change; Earth system interactions; ecosystem modeling; green water; vetenskap om hållbar utveckling; Sustainability Science;

   Sammanfattning : The planetary boundaries framework is an effort to define a safe operating space for humanity. Its rationale is that sustainable development needs to be achieved in ways that safeguard the stability of the Earth system on which human prosperity relies. LÄS MER

7. 5. Peatland dynamics in response to past and potential future climate change : A regional modelling approach

   Författare :Nitin Chaudhary; BECC: Biodiversity and Ecosystem services in a Changing Climate; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; PEATLANDS; PERMAFROST; Carbon accumulation; Microtopography; LPJ-GUESS; Earth system models;

   Sammanfattning : The majority of the northern peatlands developed during the Holocene as a result of a positive mass balance between net primary productivity (NPP) and heterotrophic decomposition rates. Over that time they have sequestered a huge amount of carbon in terrestrial ecosystems. LÄS MER