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            <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/dataset/839041.rdf" xlink:actuate="onRequest">Diel carbonate and nutrient chemistry reported for different benthic reef communities under ambient and acidified conditions during summer and winter</gmx:Anchor>
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            <gco:CharacterString>Cite this dataset as: Page, H., Andersson, A. (2021) Diel carbonate and nutrient chemistry reported for different benthic reef communities under ambient and acidified conditions during summer and winter. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2021-01-28 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/839041 [access date]</gco:CharacterString>
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        <gco:CharacterString>Diel carbonate and nutrient chemistry Dataset Description:  Methods and Sampling: &amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;General study design:&amp;lt;/strong&amp;gt;&amp;lt;br /&amp;gt;
This experiment was designed to quantify and compare the influence of different benthic reef communities on diel seawater carbonate and nutrient chemistry under ambient and acidified conditions during summer and winter in flow-through mesocosms.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Methods description:&amp;lt;/strong&amp;gt;&amp;lt;br /&amp;gt;
Different coral reef benthic communities (carbonate sand, crustose coralline algae, coral, fleshy macroalgae, and a mixed community) were created in outdoor flow-through mesocosms at Hawaii Institute of Marine Biology. Diurnal seawater chemistry was measured for communities experiencing ambient or acidified (ambient pH – 0.4) seawater conditions during summer (August 2013) and winter (January 2014). Acidification treatments were achieved by CO2 (g) bubbling of the header tank. Hourly water quality measurements were taken over the course of 26-hours with water samples collected for analysis of dissolved inorganic carbon and total alkalinity every 2 hours and for inorganic nutrients every 4 hours. A total of four experiments were conducted across two seasons (Summer and Winter) and two pH treatments (ambient and acidified). Seawater chemistry data were used to calculate diurnal net community production (NCP) and net community calcification (NCC) rates using modified standard equations (Langdon et al. 2010). In addition, the attribution of these processes to diurnal pH and saturation state changes were quantified.;&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;For additional details, please see Page et al. (2016).&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Analytical Methods:&amp;lt;/strong&amp;gt;&amp;lt;br /&amp;gt;
Seawater samples were collected by hand using 250 ml Pyrex glass bottles and immediately fixed with 100 µL HgCl2 as per standard protocols (Dickson et al. 2007). Handheld YSI multi-meter instrument was used to measure temperature, salinity, dissolved oxygen, and pH at the time of sampling. All seawater samples were transported to the Scripps Coastal and Open Ocean Biogeochemistry lab and analyzed for TA via an open-cell potentiometric acid titration system developed at Scripps Institution of Oceanography (SIO) by A. Dickson (Dickson et al. 2007) and DIC via an automated infra-red inorganic carbon analyzer (AIRICA, Marianda Inc).&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Quality Control:&amp;lt;/strong&amp;gt;&amp;lt;br /&amp;gt;
Standard protocols were followed for sampling and analysis of seawater TA and DIC (Dickson et al. 2007). YSI multi-meter instrument was calibrated prior to each sampling period with accuracies of 0.2 °C for temperature, 1% for salinity, ±2% for dissolved oxygen saturation, 0.2 mg/L for dissolved oxygen concentration, and 0.2 for pH. The accuracy and precision of TA (-0.2 ± 3.3 μmol/kg) and DIC (-1.0 ± 2.3 μmol/kg) measurements were evaluated using certified reference materials (CRM) provided by the laboratory of A. Dickson at SIO and analyzed every 5 samples for DIC and ~15-20 samples for TA.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Known Problems:&amp;lt;/strong&amp;gt;&amp;lt;br /&amp;gt;
Rows where Date is&amp;amp;nbsp;06-01-14 and Time values are 10:14 to 10:44 (inclusive) (lines&amp;amp;nbsp;866-881 in original Excel file): The YSI Pro Plus Handheld Multi-meter temporarily malfunctioned, so temperature and salinity data were measured using an alternate handheld multi-meter probe.&amp;lt;/p&amp;gt;</gco:CharacterString>
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        <gmx:Anchor xlink:href="http://lod.bco-dmo.org/id/award/737877.rdf" xlink:title="OCE-1255042" xlink:actuate="onRequest">Funding provided by NSF Division of Ocean Sciences (NSF OCE) Award Number: OCE-1255042 Award URL: https://www.nsf.gov/awardsearch/show-award?AWD_ID=1255042</gmx:Anchor>
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	Description: &lt;p&gt;Time of measurements (local time; HST); format: hh:mm:ss&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839056.rdf
	Name: ISO_DateTime_UTC
	Units: unitless
	Description: &lt;p&gt;Date and time of measurements (UTC) in ISO8601 format: YYYY-MM-DDThh:mm:ssZ&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839057.rdf
	Name: MesocosmID
	Units: unitless
	Description: &lt;p&gt;Mesocosm identification&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839058.rdf
	Name: Community
	Units: unitless
	Description: &lt;p&gt;Reef community within the mesocosm&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839059.rdf
	Name: Temp
	Units: degrees Celsius
	Description: &lt;p&gt;In situ temperature&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839060.rdf
	Name: Salinity
	Units: unitless
	Description: &lt;p&gt;In situ salinity&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839061.rdf
	Name: DO_sat
	Units: unitless (percent)
	Description: &lt;p&gt;In situ dissolved oxygen percent saturation&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839062.rdf
	Name: DO_conc
	Units: milligrams per liter (mg/L)
	Description: &lt;p&gt;In situ dissolved oxygen concentration&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839063.rdf
	Name: pH_ysi
	Units: unitless
	Description: &lt;p&gt;In situ pH&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839064.rdf
	Name: TA
	Units: micromoles per kilogram (umol/Kg)
	Description: &lt;p&gt;In situ total alkalinity&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839065.rdf
	Name: DIC
	Units: micromoles per kilogram (umol/Kg)
	Description: &lt;p&gt;In situ dissolved inorganic carbon&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839066.rdf
	Name: Total_N
	Units: micromoles per liter (umol/L)
	Description: &lt;p&gt;In situ dissolved inoganic nitrogen and nitrate&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839067.rdf
	Name: Nitrite
	Units: micromoles per liter (umol/L)
	Description: &lt;p&gt;In situ dissolved nitrite&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839068.rdf
	Name: Inorg_P
	Units: micromoles per liter (umol/L)
	Description: &lt;p&gt;In situ dissolved inorganic phosphorus&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839069.rdf
	Name: Silicate
	Units: micromoles per liter (umol/L)
	Description: &lt;p&gt;In situ dissolved silicate&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839070.rdf
	Name: Ammonia
	Units: micromoles per liter (umol/L)
	Description: &lt;p&gt;In situ dissolved ammonia&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839071.rdf
	Name: Nitrate
	Units: micromoles per liter (umol/L)
	Description: &lt;p&gt;In situ dissolved nitrate&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839072.rdf
	Name: pH_calc
	Units: unitless
	Description: &lt;p&gt;In situ pH (total scale) calculated from in situ temperature, salinity, TA, and DIC&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839073.rdf
	Name: Omega_calc
	Units: unitless
	Description: &lt;p&gt;Seawater saturation state with respect to aragonite calculated from in situ temperature, salinity, TA, and DIC&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839074.rdf
	Name: pCO2_calc
	Units: microatmospheres (uatm)
	Description: &lt;p&gt;In situ pCO2 calculated from in situ temperature, salinity, TA, and DIC&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839075.rdf
	Name: NCC
	Units: millimoles per square meter per hour (mmol/m^2/h)
	Description: &lt;p&gt;Net community calcification rate&lt;/p&gt; 
http://lod.bco-dmo.org/id/dataset-parameter/839076.rdf
	Name: NCP
	Units: millimoles per square meter per hour (mmol/m^2/h)
	Description: &lt;p&gt;Net community primary production rate&lt;/p&gt; 
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This experiment was designed to quantify and compare the influence of different benthic reef communities on diel seawater carbonate and nutrient chemistry under ambient and acidified conditions during summer and winter in flow-through mesocosms.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Methods description:&amp;lt;/strong&amp;gt;&amp;lt;br /&amp;gt;
Different coral reef benthic communities (carbonate sand, crustose coralline algae, coral, fleshy macroalgae, and a mixed community) were created in outdoor flow-through mesocosms at Hawaii Institute of Marine Biology. Diurnal seawater chemistry was measured for communities experiencing ambient or acidified (ambient pH – 0.4) seawater conditions during summer (August 2013) and winter (January 2014). Acidification treatments were achieved by CO2 (g) bubbling of the header tank. Hourly water quality measurements were taken over the course of 26-hours with water samples collected for analysis of dissolved inorganic carbon and total alkalinity every 2 hours and for inorganic nutrients every 4 hours. A total of four experiments were conducted across two seasons (Summer and Winter) and two pH treatments (ambient and acidified). Seawater chemistry data were used to calculate diurnal net community production (NCP) and net community calcification (NCC) rates using modified standard equations (Langdon et al. 2010). In addition, the attribution of these processes to diurnal pH and saturation state changes were quantified.;&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;For additional details, please see Page et al. (2016).&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Analytical Methods:&amp;lt;/strong&amp;gt;&amp;lt;br /&amp;gt;
Seawater samples were collected by hand using 250 ml Pyrex glass bottles and immediately fixed with 100 µL HgCl2 as per standard protocols (Dickson et al. 2007). Handheld YSI multi-meter instrument was used to measure temperature, salinity, dissolved oxygen, and pH at the time of sampling. All seawater samples were transported to the Scripps Coastal and Open Ocean Biogeochemistry lab and analyzed for TA via an open-cell potentiometric acid titration system developed at Scripps Institution of Oceanography (SIO) by A. Dickson (Dickson et al. 2007) and DIC via an automated infra-red inorganic carbon analyzer (AIRICA, Marianda Inc).&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Quality Control:&amp;lt;/strong&amp;gt;&amp;lt;br /&amp;gt;
Standard protocols were followed for sampling and analysis of seawater TA and DIC (Dickson et al. 2007). YSI multi-meter instrument was calibrated prior to each sampling period with accuracies of 0.2 °C for temperature, 1% for salinity, ±2% for dissolved oxygen saturation, 0.2 mg/L for dissolved oxygen concentration, and 0.2 for pH. The accuracy and precision of TA (-0.2 ± 3.3 μmol/kg) and DIC (-1.0 ± 2.3 μmol/kg) measurements were evaluated using certified reference materials (CRM) provided by the laboratory of A. Dickson at SIO and analyzed every 5 samples for DIC and ~15-20 samples for TA.&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;Known Problems:&amp;lt;/strong&amp;gt;&amp;lt;br /&amp;gt;
Rows where Date is&amp;amp;nbsp;06-01-14 and Time values are 10:14 to 10:44 (inclusive) (lines&amp;amp;nbsp;866-881 in original Excel file): The YSI Pro Plus Handheld Multi-meter temporarily malfunctioned, so temperature and salinity data were measured using an alternate handheld multi-meter probe.&amp;lt;/p&amp;gt;</gco:CharacterString>
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Carbonate chemistry (pH_calc, pCO2_calc, and omega_calc) was constrained using CO2SYS software (Lewis and Wallace 1998). Data were processed and statistically compared using R Software (v 3.2.0).&amp;lt;/p&amp;gt;

&amp;lt;p&amp;gt;&amp;lt;strong&amp;gt;BCO-DMO Processing:&amp;lt;/strong&amp;gt;&amp;lt;br /&amp;gt;
- added UTC date/time field in ISO8601 format.&amp;lt;/p&amp;gt;</gco:CharacterString>
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