About nitrogen comparisons

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Javier Fernando Mendez Monroy

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Jun 21, 2021, 12:40:24 PMJun 21
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Dear all.

I hope to find you safe an well during these times.

I am comparing nitrogen outputs with reported values from USGS stations. In APEX documentation there are two main outputs for Nitrogen; YN-Sediment transported N from subarea or reach and QN-Nitrogen in runoff. From USGS I am obtaining the following ones.

  • Nitrate:  mg/l as N and mg/l as NO3
  • Nitrite:  mg/l as N and mg/l asNO2
  • Nitrogen, mixed forms (NH3), (NH4), organic, (NO2) and (NO3): mg/l
  • Ammonia and ammonium:  mg/l as N and mg/l NH4
  • Inorganic nitrogen (nitrate and nitrite):  mg/l as N
  • Kjeldahl nitrogen: mg/l as N

I am comparing QN from APEX with Nitrate as NO3 from USGS.

I would like to ask you kindly if I am right or if you have any suggestion related to other comparisons I can do.

Thanks in advance for your help.


Luca

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Jun 25, 2021, 11:07:34 AMJun 25
to EPIC / APEX Modeling Forum
Dear Javier,

I would compare the model outputs against what is reported as N and not NO3.
I will try to find some time to look at the code to be sure of what I am suggesting you here.

Best,
Luca

Javier Fernando Mendez Monroy

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Jul 2, 2021, 12:31:26 PMJul 2
to EPIC / APEX Modeling Forum
Thank you so much.

I will be very attentive to your response.

On Monday, June 21, 2021 at 11:40:24 AM UTC-5 Javier Fernando Mendez Monroy wrote:
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