Reply on RC2

The English was checked by a native and some abbreviations were replaced by the full Abstract The Abstract provides a good summary of the paper. However, as with the paper as a whole, provide one or two sentences at the end which explain why this is important. One sentence was added at the end of the abstract. See L. 22-25. in next Our apologies, were in This


Introduction
As noted above, the first paragraph of the introduction introduces some important general issues that need to be addressed throughout the paper, especially at the end.
The first paragraph was changes following the indications of another reviewer. The importance of findings was added at the end of the discussion section. See L. 399-405.
The referencing in parts of the introduction can be improved. For example, several of the references in L33-45 are reports and Bieroza et al., 2018;D'Amario et al., 2021 deal with techniques. Try to add a few key papers that discuss these general issues. The sentence was modified in the revised manuscript. See L. 41-43 L50-54. Some of the concepts here could also use better referencing. Evans & Davies (1998: Water Resources Research, 34, 129-137) and Walling and Foster (1975: Journal of Hydrology, 26, 237-244) present some of the framework for these studies. Lloyd et al. (2016: Hydrology and Earth Systems Sciences, 20, 625-632) develop a framework for characterising hysteresis and also reference other literature. The recent paper by Knapp et al. (2020: Hydrology and Earth System Sciences, 24, 2561-2576 Vaughan et al. (2017: Water Resources Research, 53, 5345-5363);Jiang et al. (2010: Soil Sci Plant Nutr, 56, 72-85). Other papers (eg Knapp et al., 2020) apply similar methodology to other solutes (including other nutrients such as P). The way that this is written implies that there is little work being done in this space, when there is a large body of work that needs acknowledging. L70-85. The objectives are very specific and parochial. While they describe what you have done and why it is locally important, can you reframe them so that they have a more general focus (ie understanding differences in the behaviour of TKN and NO3 that we do not understand in general) The objectives were rewritten in the revised manuscript. See L. 83-88.
L73-74. The studies cannot become increasingly rare -do you mean that there have not been many thus far?
Our apologies, it was a mistake.
L74-76. If understanding TKN is important, you could mention it in the main part of the introduction with a few more details rather than in your objectives section. It is a bit lost here.
It was mentioned in the revised manuscript. See L. 72-80.

Materials and Methods
The description of the Study Site (Section 2.1) is comprehensive.
L105-108. Is this the meteorology of the site or of the region (not sure if there are 10045 stations, which seems a lot, or if that is the station identifier and the sentence is slightly misworded).
10045 is the ID of the meteorological station. See L. 115 L108. What do you mean by "pluvial" in this context? It means that hydrological regime follows the rainfall. The information was added in the revised manuscript. See figure 2 in the revised manuscript L125-128. The preservation and storage of samples presumably is only after they are retrieved from the autosampler. How much of a delay between collection and storage was there and does this have an impact (I presume not).
The samples were removed from the autosampler within a few hours after runoff events. See L. 137-138.
L125-132. Minor point, but here and elsewhere be consistent with specifying valences or not.
Our apologies, we try to be consistent.
L135-139. For clarity, can you include a figure of a typical event showing rainfall, streamflow, and concentration data. That would help visualise the data and interpretation of events etc.
Following your comment, figure 3 was added in the revised manuscript L140-151. These is some repetition here as you say that there are three groups of variables, describe broadly what they are, and then explain that in more detail. Some of these variables do not seem to have been explained -how did you calculate KE and I presume that WY is Q / catchment area? Some of the parameters associated with the Q-C loops would be clearer if they were on a figure (previous comment).
The description of the variables was improved. See L. 155-163. In addition, a schematic representation of the hysteresis loops was added. See figure 4 in the revised manuscript.

L151. Metal?
Our apologies, it is a mistake.
L154-159. There are probably better references. Yu & Schwartz (1999, Hydrol. Process., 13, 191-209) has an early general explanation. For these general statements, try to quote some of the early papers that develop the techniques or review-style papers.
Following the comments of the reviewers, the paragraph was deleted in the revised mansucript.
L154-168. The use of EC in this way makes a range of assumptions (e.g., that pre-rainfall EC represents water from within the catchment, not a mix of that water and recent prior rainfall; that we know the EC of surface runoff; that the contrast in rainfall and catchment water EC is high). These are discussed in many papers that have used that technique (e.g. Miller et al., 2014, Water Resour. Res., 50, 6986-6999;Miller et al., 2016, Water Resour. Res., 52, 330-347;Riis et al., 2015, J. Hydrol. Reg. Stud., 4, 91-107;Rumsey et al., 2017, Hydrol. Process., 31, 4705-4718). Some comments are needed here if you are going to use that technique. Actually, I am not sure whether you really need this parameter -there is a little discussion in section 3.3 but not much else (?). Given the considerable uncertainties in using an EC mass balance, you probably could safely omit it.
Following the comments of the reviewers, the paragraph was deleted in the revised mansucript.
Thank you for the correction L206-210. This just says that these methods were used. In particular is there any reason that the Redundancy Analysis offers more than the correlations? Any details that we should know? Some information about RDA was added. See L. 223-225 Figure 2. Without some more details, it is difficult to interpret this diagram. I presume a & b have similar rotation but different slopes? How close to the start of the events are the first points and what time periods do these events depict (do the points within each graph and between graphs represent the same timesteps). More could be done to make it clear what is going on here.

Results
Some information was added to figure 2, i.e., figure 5 in the revised manuscript.
L223-233. There are a lot of generalities here ("highs", "lows" etc) and Table 1 only shows summary statistics. Add a few more details to the text to explain and consider adding a Supplement Table with  L240-242. In the methods you introduced the +/-10% cut off for neutral loops, so you just use that here from the outset. So just note that 13% have DR values within the 10% limit and are classified as neutral. As written, it is not very clear how many of the loops you consider to be what type and whether you are being consistent in definitions.
This part of the method and results were modified. See L. 214-218, 262-263, 271-272 L242-244 L258-261. You should discuss that you are using a Pearson correlation matrix and any relevant derails in the methods.

Discussion
This is a long section and a brief introduction at the start guiding the reader through what you intend to discuss would be good. There is also a tendency to interpret your data by reference to other studies (so on L304-305 you explain the results of others and then discuss your interpretations in the next few sentences). It would be preferable to discuss your interpretations and justify them using your data and then note whether they are similar or different to those elsewhere. Otherwise it looks like you are trying to fit your data into an existing framework, which I don't think is the case. L294-303. This seems to be off topic with the title of this section. Does it belong here? Perhaps it go be fore the sectiion heading and act as a general lead-in?
It´s mean increasing, but it was deleted.
L310-321. There is a lot of speculation here (deep drainage, high NO3 in soils, rapid transport). Can you provide justification -there seems to be a number of prior studies on this area that may help. Some justifications were provided. See L. 330-348.
L324-L330. In section 2, you say that overland flow is unusual, so how can that be?
Surface runoff represents a small portion of streamflow during runoff, but in some cases could be important delivering particulate matter.
L334-350. Similar to the comments above, there is a lot of speculation here. While studies elsewhere may help with that, is there evidence from this catchment that you could use to firm these ideas up.