Temporal and Spatial Variation Characteristics of Precipitation in the Haihe River Basin under the Influence of Climate Change

Round 1

Reviewer 1 Report

The article is based on, I can say „classic” approach, for this kind of data. Those statistical tests have been applied for similar investigational in number of studies. The results are a local one, however are important for this part of world. The only comment I have, it is that, this article do not fit very much to “Water”. May be it will be better to put it to “ Atmosphere”. In article authors show only temperature and precipitation without any connection with outflow.

Author Response

Dear Editors and Reviewer 1:

Thank you for your letter and for the reviewers’ comments concerning our manuscript entitled “Temporal and Spatial Variation Characteristics of Precipitation in the Haihe River Basin under the Influence of Climate Change” (water-1250523). We have studied comments carefully and have made reply which we hope meet with approval.

Reviewer 2 Report

General Comments

In the manuscript "Temporal and Spatial Variation Characteristics of Precipitation in the Haihe River Basin under the Influence of Climate Change" is applied the known method for estimating the trend such as Mann-Kendall test, and the Spearman correlation coefficient is used to analyze the relationship between precipitation temperatures.

The two methods were well chosen because both are non-parametric tests. The approach fits very well with the topics of the Water journal.

The study is worthy of publication, but after the authors improve the manuscript, especially in terms of presentation, in a more explanatory form.

 

Specific COMMENTS

- At line 153, please verify the eq. (2-1), at the upper limit of j;  I recommend you to read the following publication and in Appendix are given details of the equations assigned to the Mann-Kendall and Spearman tests. Also check the other equations (such as (2-3) and (2-5)). Please comment in which case the equation (2-3) is valid’

 

Yue, S., Pilon, P. and Cavadias, G.: 2002 Power of the Mann-Kendall and Spearman’s rho tests for detecting monotonic trends in hydrological series, J. Hydrol. 259(1–4), 254–27

 

-         I suggest you keep the same notations for the time series data (for example see lines 171 and 149, where notations are different);

-         At line 176 please replace "confidential" with "significance";

-         For the equations (2-10) specify what means d_i (e.g. d_i= the difference   between the ranks of corresponding variables, n= number of observations);

-         Please give details about the classifications in Table 1 (give a reference or mention if it is special classification for the data analyzed) ;

-         In Figure 3 what does the significance level refer to?? On the following figures specify what the  significance  refers to and what represent the gradations, did you mean the values of statistic Z?? I recommend the paper:

 

Nikzad Tehrani, E., Sahour, H. & Booij, M.J. Trend analysis of hydro-climatic variables in the north of Iran. Theor Appl Climatol 136, 85–97 (2019). https://doi.org/10.1007/s00704-018-2470-0

 

• The Table 2 should be centered;
• Did you calculate the significance level for Spearman coefficients ? If Yes, please present the results, if you have not tested the significance  describe at least in the text how to make the significance; You can see Table 5 of the publication:

Djigbo Félicien Badou, Evison Kapangaziwiri, Bernd Diekkrüger, Jean Hounkpè & Abel Afouda (2017): Evaluation of recent hydro-climatic changes in four tributaries of the Niger River Basin (West Africa), Hydrological Sciences Journal, 62:5, 715-728, DOI: 10.1080/02626667.2016.1250898

 

• For future investigations it is good to carry out statistical significance tests of the results depending on the length of the time series analyzed.

Comments for author File: Comments.pdf

Author Response

Dear Editors and Reviewer 2:

Thank you for your letter and for the reviewers’ comments concerning our manuscript entitled “Temporal and Spatial Variation Characteristics of Precipitation in the Haihe River Basin under the Influence of Climate Change” (water-1250523). We have studied comments carefully and have made reply which we hope meet with approval.

Author Response File: Author Response.pdf