04: Biosphere-Atmosphere Exchange: From kinetic theory to the limits of plant life, 10.08.2017

Transport Phenomena in the Biosphere

04 | 0:00:00 Start 0:00:59 Collaborators 0:02:12 Introduction 0:03:09 Evaporation: A Molecular Perspective 0:05:57 From ‘Molecular‘ to ‘Turbulence‘ 0:07:59 Bringing in the energy 0:10:38 Combination equation and thermal stratification effects 0:11:34 Bringing in the plants 0:13:35 Stomata and the climate system 0:15:08 Stomata and climate 0:16:21 Stomata and the climate system 0:18:37 Droughts and Forest Mortality 0:19:38 Water transport theories 0:22:45 Question: 0:23:38 Hypothesis for each system 0:27:03 Leaf gas – exchange equations 0:28:53 Contemporary empirical formulations 0:30:37 Widely used in climate models 0:32:25 Optimization model (Lan Cowan) 0:35:27 Optimization model 0:36:55 Linearized biochemical demand function 0:39:55 Optimization model 0:41:22 Recovery of empirical models 0:43:49 Stomatal responses to vapor pressure deficit: Is the D^-1/2 consistent with literature responses? 0:45:29 Stomatal responses to vapor pressure deficit: Is the D^-1/2 reasonable? 0:45:53 Optimization models (Linear form) 0:47:28 Apparent feed – forward mechanism 0:52:36 Optimization models and apparent feed–forward mechanism 0:53:24 Apparent feed–forward mechanism 0:53:53 Apparent feed–forward mechanism for Rubisco–limited Photosynthesis 0:55:27 Apparent feed-forward mechanism: Revisiting Bunce(1997) data 0:56:20 More on the onset of apparent feedforward mechanism 0:58:44 Revise to accommodate mesophyll 1:00:34 Linearized formulation 1:03:02 Model results 1:04:02 How to specify ? for a fluctuation water supply? 1:04:48 Plausibility argument for a constant ? on short times 1:09:01 Single dry–down time scale 1:11:17 Konrad et al. 2008: Determine ?ww from Stomatal pore geometry and diffusion 1:11:50 Hydraulic transport 1:12:51 Maximum hydraulic transport 1:22:16 Sugar mass transport in Phloem 1:24:14 Optimal sugar concentration 1:25:20 Putting it all together – coordination 1:26:28 Conclusions and Future Directions 1:27:49 Future Directions