Review Reports - Monitoring of Chlorophyll-a Levels in Lakes

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

General comments:

This study demonstrates significant scientific merit and practical potential:
The investigation targets Serbia's ecologically and economically vital lakes (Palic and Ludas), bridging critical gaps between environmental protection and sustainable tourism development, providing actionable insights for Balkan water resource management. The integration of Sentinel-2 imagery with C2RCC atmospheric correction enables efficient non-contact monitoring of chlorophyll a. At the same time, multivariate regression modeling enhances predictive reliability through rigorous statistical validation (Pearson correlation, Shapiro-Wilk tests). The developed model offers direct operational value for algal bloom early-warning systems and tourist safety assurance, supported by authoritative data sources (ESA satellites + local health agencies).

However, the current version of the manuscript is not suitable for publication. The author need to read the guide for author carefully and satisfy the requirements for figures and tables. The construction of the manuscript need to adjust, such as disccusion without conclusion.

Specific coments:
To strengthen methodological robustness and model performance, the following key revisions are proposed:
1.Data expansion and validation:
Increase sampling density and frequency (monthly recommended) in low-accuracy zones (N1/N2), with additional independent dataset validation.
2. Enhance environmental variables:
Incorporate meteorological drivers (temperature/precipitation/wind from ERA5).
3. Expand the discussion:
Mechanistically explain model failures in N1/N2 (e.g., spectral interference from anthropogenic activities);
Quantify uncertainty propagation from atmospheric correction errors.

Author Response

Please refer to the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

Comments and Suggestions for Authors

Elucidate how the proposed approach enhances sustainability and identify the existing ways it seeks to supplant or ameliorate.
Offer a concise rationale for employing Sentinel 2 and the LC1 products, emphasizing their distinct benefits for monitoring Chlorophyll-a.
Provide additional specifics regarding the discrepancies in model performance, particularly with artificial impacts or environmental factors.
Propose a more precise recommendation for enhancing the models in subsequent research.
Examine the wider ramifications of the research and its prospective uses in additional aquatic environments outside the analyzed lakes.

Author Response

Please refer to the attachment.

Author Response File: Author Response.pdf

Reviewer 3 Report

Comments and Suggestions for Authors

The manuscript is written in detail. The methodology is well explained, and the results are presented in an acceptable manner. However, the authors are encouraged to reduce redundant content in the Introduction and Methodology sections.

The title is too broad, please revise it by including specific key terms that reflect the scope of the research.

The Introduction section is overly lengthy. Consider condensing the content and clearly highlighting the research gap and the novelty of the study.

Section 2.2.1. Water Quality Measurements – Please explain the methodologies used for these measurements in this section.

How do the proposed models account for seasonal variability in chlorophyll levels? What are the key influencing factors affecting the models' predictability?

There are numerous typos and language errors throughout the manuscript. For example, in the title, check the spelling of "Chlorophyll." In line 240, "weel" should be corrected. There are many.

Avoid using contractions or informal language (e.g., replace “isn’t” with “is not”).