EML

As requested, here is the list of customUnits used by sbclter (to date). The
current version of this list can be found at the url above. Several of these
units need addional attributes or definition. These are commonly-used units in
oceanography and limnology.

<unit id="reciprocalMeter" name="reciprocalMeter" unitType="lengthReciprocal"
abbreviation="m-1" parentSI="meter" multiplerToSI="1">
<description>per meter, describes optical properties</description>
</unit>

<unit id="reciprocalMetersPerSteradian" name="reciprocalMetersPerSteradian"
unitType="lengthReciprocal" abbreviation="m-1*sr-1" parentSI="meter"
multiplerToSI="">
<description>describes directional optical measurements</description>
</unit>

<unit id="microwattsPerSquareCentimeterPerNanometer"
name="microwattsPerSquareCentimeterPerNanometer" unitType="power" parentSI="joule">
<description>irradance unit</description>
</unit>

<unit id="microwattsPerSquareCentimeterPerNanometerPerSteradian"
name="microwattsPerSquareCentimeterPerNanometerPerSteradian" unitType="power"
parentSI="joule">
<description>directional irradiance unit</description>
</unit>

<unit id="microeinsteinsPerSquareMeterPerSecond"
name="microeinsteinsPerSquareMeterPerSecond" unitType="energy" parentSI="joule">
<description>
PAR irradiance unit, Seabird 911. 1Ein = energy of 1 mole photons
</description>
</unit>

<unit id="microeinsteinsPerSquareCentimeterPerSecond"
name="microeinsteinsPerSquareCentimeterPerSecond" unitType="energy"
parentSI="joule">

<description>
PAR Scalar irradiance unit. 1Ein = energy of 1 mole photons
</description>
</unit>

<unit id="decibar" name="decibar" unitType="pressure" abbreviation="dbar"
parentSI="pascal" multiplerToSI="10,000">
<description>pressure, oceanography</description>
</unit>

<unit id="hectoPascal" name="hectoPascal" unitType="pressure" abbreviation="hPa"
parentSI="pascal" multiplerToSI="100">
<description>
SI unit for atmospheric pressure, equivalent in magnitude to millibar
</description>
</unit>
-
<unit id="percent" name="percent" unitType="massPerMass" abbreviation="o/o"
parentSI="gramsPerGram" multiplerToSI=".01">
<description>parts per hundred</description>
</unit>

<unit id="permil" name="permil" unitType="massPerMass" abbreviation="o/oo"
parentSI="gramsPerGram">
<description>
parts per thousand relative to a std composition. UC-delta used for isotope
enrichment = (Rx / Rs - 1) ·1000. o/oo used for salinity
</description>
</unit>

<unit id="sigma_unit" name="sigma_unit" unitType="massDensity"
parentSI="killogramsPerCubicMeter" constantToSI="-1000" multiplerToSI="1">
<description>seawater density = kg/m3 -1000</description>
</unit>

<unit id="millimolesPerCubicMeter" name="millimolesPerCubicMeter"
unitType="amountOfSubstanceConcentration" abbreviation="mmol*m-3"
parentSI="molesPerCubicMeter" multiplerToSI=".001">
<description>concentration unit</description>
</unit>

<unit id="micromolesPerLiter" name="micromolesPerLiter"
unitType="amountOfSubstanceConcentration" parentSI="molesPerCubicMeter"
multiplerToSI=".001">
<description>
concentration, same magnitude as micromolar (for a dissolved constituent)
</description>
</unit>

<unit id="microequivalentsPerLiter" name="microequivalentsPerLiter"
unitType="amountOfSubstanceConcentration" parentSI="molesPerCubicMeter"
multiplerToSI="">
<description>
concentration of charge (on dissolved ions). A single multiplier to SI is not
possible, since conversion includes valence of ion.
</description>
</unit>

<unit id="siemensPerMeter" name="siemensPerMeter" unitType="conductance"
abbreviation="S*m-1" parentSI="siemen" multiplerToSI="1">
<description>conductivity unit, seawater</description>
</unit>

<unit id="microsiemensPerCentimeter" name="microsiemensPerCentimeter"
unitType="conductance" parentSI="siemen" multiplerToSI=".0001">
<description>conductivity unit, freshwater</description>
</unit>

<unit id="milligramsPerSquareMeterPerDay" name="milligramsPerSquareMeterPerDay"
unitType="areaMassDensityRate" abbreviation="mg*m-2*d-1"
parentSI="kilogramsPerSquareMeterPerSecond" multiplerToSI="8.64E10">
<description>
areal primary production rate, often in mg-Carbon for an integrated water column
</description>
</unit>

<unit id="kilogramsPerSquareMeterPerDay" name="kilogramsPerSquareMeterPerDay"
unitType="areaMassDensityRate" abbreviation="kg*m-2*d-1"
parentSI="kilogramsPerSquareMeterPerSecond" multiplerToSI="86400">
<description>
areal primary production rate, may be kg-DW, Carbon or -nitrogen for kelp
</description>
</unit>

<unit id="milligramsPerCubicMeterPerDay" name="milligramsPerCubicMeterPerDay"
unitType="volumetricMassDensityRate" abbreviation="mg*m-3*d-1" parentSI=""
multiplerToSI="">
<description>
volumetric primary production rate, in a parcel of water
</description>
</unit>