Dear Editor,

please, find attached my review on MS ESSD-2023-239. 

Thank you very much for considering my expertise as a reviewer of ESSD.

Best regards,

Roberta Guerra

please, check 'Ćháʔba' throughout the MS text, supplementary material and tables.

Cruise time-series can provide spatial context to data sets with higher temporal resolution, provide invaluable validation for numerical simulations, and frame biological experiments and observations with information about relevant environmental complexity

In this context, the manuscript presents a major effort, over a decade, to obtain a very careful dataset of the main physical-chemical variables and nutrient concentrations in the southern Salish Sea and its boundary waters in the Strait of Juan de Fuca and nearby coastal waters.

This data product provides diverse end users useful and unique information needed to frame biological impacts research, validate numerical models, inform water quality and fisheries management, and support decision makers.

The analytical methods are described in a very detailed way. All observations conform to the ocean carbon community best practices

With regard to data quality, extended QC procedures have been carried out to ensure that only the highest quality data is archived.

The manuscript is a contribution to the Coastal Ocean Data Analysis Product in North America (CODAP-NA, Jiang et al., 2021), as it incorporates estuarine datasets, which are critical for assessing the ongoing acidification of coastal and estuarine environments and its impacts.

 All finalized data described in this publication can be accessed through the Ocean Carbon and Acidification Data Portal

For all the above reasons, this manuscript is considered a key contribution to the characterization of a complex coastal zone such as estuaries, areas considered to be particularly vulnerable. The dataset produced will contribute to the validation of 3-D models of oceanic conditions, as well as to studies related to ocean acidification and the effects on the biota of the region.

Erratum in line 281. For "WOCE water sample quality flag definitions listed in the footnotes to Table 1" read "WOCE water sample quality flag definitions listed in the footnotes to Table 2".