Journal Club

2018/11/16 led by Jongmin

Schimel, D. et al., 2015. Observing terrestrial ecosystems and the carbon cycle from space. Global Change Biology21(5), 1762-1776.

Jongmin chose this review paper to discuss the need to use satellite data and field observation together. This paper pointed out that field observation data does not represent global scales well, particularly in critical regions such as tropical and arctic regions. To overcome the weakness of field observation, a strategic combination of remote satellite and in situ data is required. However, there are still many limitations in field observation (e.g. electricity, sensor cost, manpower). We thought that near-surface sensors were expensive and slow to develop. To collect more in-situ data in the critical regions, we concluded 1) collaboration with local people is necessary and 2) we should hit on a new way such as automatic drone to observe vegetation.

2018/11/9 led by Yorum

Powell, K. (2017). Work–life balance: Break or burn out. Nature, 545(7654), 375-377.

Yorum discussed how individual lab members think about the work and life balance. Most of the members fully agreed with the importance of personal life since it refreshes their head (e.g. brings up new ideas, new approach) and makes a positive mind. However, there was one opinion that the stress of being unable to separate the work and life balance would also be harmful to the quality of life. One of the most important and difficult to implement is work and life balance. We concluded that it would be best for life to change in a good way while still experiencing trial and error.

2018/9/21 led by Youngryel

Berry, J.A. (2012) There Ought to Be an Equation for That. Annual Review of Plant Biology 63, 1-17.

We discussed how collaboration advances science.

2018/09/14 led by Yulin

Wang, E., Martre, P., Zhao, Z., Ewert, F., Maiorano, A., Rötter, R. P., … & Reynolds, M. P. (2017). The uncertainty of crop yield projections is reduced by improved temperature response functions. Nature plants, 3(8), 17102. DOI: 10.1038/nplants.2017.102

 Yulin presented this article to discuss the temperature response functions for reducing the uncertainty of crop modeling. This paper proposes a new temperature response function based on new research findings. But the extremely high-temperature research gaps have not been fulfilled.  To better understand the crop adaptation results, a climate control chamber experiment can be considered. And to properly apply the function to global level, we still need to understand the variation of the function at different climate zones and for different crops.

2018/09/03 led by Juwon

Xiao-Peng Song, Matthew C. Hansen, Stephen V. Stehman, Peter V. Potapov, Alexandra Tyukavina, Eric F. Vermote & John R. Townshend, (2018), Global land change from 1982 to 2016, Nature 560, 639-643 https://doi.org/10.1038/s41586-018-0411-9

Juwon picked this letter to discuss the interactions between terrestrial vegetation and atmosphere to understand the Earth system or climate in the different aspects. First, we divided into believing human observation or not believing and discussed the method part. Next, we had a free talk about the paper. Jongmin criticized that the result was not based on field observation. Youngryel pointed out that this land-use and land-cover change show big data application and photosynthesis response to temperature on tropical forest should be different than temperate forest. Ben talk about the result that focused on the dominant story and not including understory.  

2018/08/24 led by Ben

Zhang, Y., Guanter, L., Joiner, J., Song, L., & Guan, K. (2018). Spatially-explicit monitoring of crop photosynthetic capacity through the use of space-based chlorophyll fluorescence data. Remote Sensing of Environment, 210, 362–374. https://doi.org/10.1016/j.rse.2018.03.031

Ben selected this very recently published paper as it is both an interesting application of SIF and a promising approach to obtain data-driven spatiotemporal Vcmax information that could be used for optimized model parameterization. In contrast to a previous publication (Zhang et al., 2014 GCB), this paper did not only use FLUXNET site data but applied the approach at the regional scale to estimate crop GPP in the US corn belt. We discussed various aspects of the paper including the need for validation of Vcmax obtained from model-inversion, effects of global bias in Vcmax vs. seasonal variation and similarity of the final model GPP results based on optimized Vcmax compared to scaled SIF. The latter point is related to parsimony considerations.

2018/08/17 led by Youngryel

National Academies of Sciences, E., Medicine (2018) Thriving on Our Changing Planet: A Decadal Strategy for Earth Observation from Space. The National Academies Press, Washington, DC.

Youngryel chose this report as it will determine the next 10 years research in NASA. The key recommendation by this reports include hyperspectral remote sensing and LiDAR, and flux appears the key research foci over the decade. Ben was excited to see his paper was cited in this important report! Yan shared recent space missions by Chinese space agency. We also discussed new opportunities from inexpensive, satellite constellations by CubeSats.