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Peer review report 1 on “Little change in heat requirement for vegetation green-up on the Tibetan Plateau over the warming period of 1998-2012”
Agricultural and Forest Meteorology 217 (2016) 521
Contents lists available at ScienceDirect
Agricultural and Forest Meteorology journal homepage: www.elsevier.com/locate/agrformet
Peer Review Report
Peer review report 1 on “Little change in heat requirement for vegetation green-up on the Tibetan Plateau over the warming period of 1998-2012”
1. Original Submission 1.1. Recommendation Minor Revision 2. Comments to Author: Forcing temperature, expressed by growing degree days (GDD), is a key parameter in mechanism-based phenological models for simulating vegetation green-up date. The manuscript aims to investigating spatial and temporal variations in GDD requirement for spring vegetation green-up on the TP during 1998-2012. In general, the paper is well organized and well written and the proposed scope of work is interesting. Therefore, once the following issues are proper addressed, the paper should be accepted for publication. 1. The author estimates GDD and CD based on onset date retrieved by remote sensing method, resulting in considerable differences between remote sensing retrieved onset date and field observed onset date. Thus, it is necessary to supplement field site data to verify the findings that conclude based on remote sensing method.
DOI of published article: http://dx.doi.org/10.1016/j.agrformet.2016.10.021. http://dx.doi.org/10.1016/j.agrformet.2016.11.257 0168-1923/
2. This paper concluded that little increase in GDD requirement, reflecting the differences in response to climate warming from region to region. However, the method in calculating GDD and CD among studies maybe partly account for the differences in results. Thus, please comparison the GDD and CD results among different methods in order to acquire more credible conclusions. 3. In general, considerable differences between soil temperature and air temperature exist, and green-up date is influenced by both soil and air temperature, thus if soil temperature is used to estimate GDD and CD, whether it will come to different conclusions compared to air temperature? 4. Additionally, I have a question to consult author. As we know, green-up date is influenced by climate factors, such as temperature, precipitation, and insolation, the GDD used in this study also estimate from air mean temperature, my question is that what is the theoretical basis to analyze the correlation between GDD and CD, non-growing season precipitation, and insolation. Is it just use statistics method to identify the influence factors from multiple related factors? 5. I suggest the authors should supplement the conclusion part of this paper. Anonymous Available online 5 December 2016
Contents lists available at ScienceDirect
Agricultural and Forest Meteorology journal homepage: www.elsevier.com/locate/agrformet
Peer Review Report
Peer review report 1 on “Little change in heat requirement for vegetation green-up on the Tibetan Plateau over the warming period of 1998-2012”
1. Original Submission 1.1. Recommendation Minor Revision 2. Comments to Author: Forcing temperature, expressed by growing degree days (GDD), is a key parameter in mechanism-based phenological models for simulating vegetation green-up date. The manuscript aims to investigating spatial and temporal variations in GDD requirement for spring vegetation green-up on the TP during 1998-2012. In general, the paper is well organized and well written and the proposed scope of work is interesting. Therefore, once the following issues are proper addressed, the paper should be accepted for publication. 1. The author estimates GDD and CD based on onset date retrieved by remote sensing method, resulting in considerable differences between remote sensing retrieved onset date and field observed onset date. Thus, it is necessary to supplement field site data to verify the findings that conclude based on remote sensing method.
DOI of published article: http://dx.doi.org/10.1016/j.agrformet.2016.10.021. http://dx.doi.org/10.1016/j.agrformet.2016.11.257 0168-1923/
2. This paper concluded that little increase in GDD requirement, reflecting the differences in response to climate warming from region to region. However, the method in calculating GDD and CD among studies maybe partly account for the differences in results. Thus, please comparison the GDD and CD results among different methods in order to acquire more credible conclusions. 3. In general, considerable differences between soil temperature and air temperature exist, and green-up date is influenced by both soil and air temperature, thus if soil temperature is used to estimate GDD and CD, whether it will come to different conclusions compared to air temperature? 4. Additionally, I have a question to consult author. As we know, green-up date is influenced by climate factors, such as temperature, precipitation, and insolation, the GDD used in this study also estimate from air mean temperature, my question is that what is the theoretical basis to analyze the correlation between GDD and CD, non-growing season precipitation, and insolation. Is it just use statistics method to identify the influence factors from multiple related factors? 5. I suggest the authors should supplement the conclusion part of this paper. Anonymous Available online 5 December 2016