Global range test
-2.5°C < T < 40°C
21.7°C < T < 40°C for Red Sea
10°C < T < 40°C for Mediterranian

Gradient test
X = mod[ T(k) - (T(k-1) + T(k+1)/2 ]
Fail if X>9°C and P<500dB
Fail if X>3°C and P>=500dB

Spike test
X = mod[ T(k) - (T(k-1) + T(k+1))/2 ] - mod[ ( T(k-1) - T(k+1)) / 2]
Fail if X>6°C and P<500dB
Fail if X>2°C and P>=500dB

Digit rollover test
Fail if mod[T(k) - T(k-1)] or mod[T(k) - T(k+1)] > 10°C

Stuck value test
Fail if all values in a profile are the same

Drift test
Fail if the averageaf the upper 100dB differs from the average of the last
good profile by greater than 1°C

-2.5°< T < 35°C
13°< T < 40°C if in Mediterranean
21.7°< T < 40°C if in Red Sea

0 to 25m = -2.0 to 37°
25 to 50m = -2.0 to 36°
50 to 100m = -2.0 to 36°
100 to 150m = -2.0 to 34°
150 to 200m = -2.0 to 33°
200 to 300m = -2.0 to 29°
300 to 400m = -2.0 to 27°
400 to 1100m = -2.0 to 27°
1100 to 3000m = -1.5 to 18°
3000 to 5500m = -1.5 to 7°
5500 to 12000m = -1.5 to 4°

Constant profile test
Fail if all values in a profile are the same

Spike test:
If mod[T2 - (T3 + T1)/2] - mod[T1-T3] /2 > 2°C then T2 fails

Top spike test:
If -10°C<(T1-T2)<0°C then T1 passes

Bottom spike test:
If -10°C<(T2 - T1)<0°C then T1 passes

Gradient test:
If mod[T2-(T1+T3)/2]>10°C then T2 fails

Inversion test:
If all T > 4°C, profile is examined for local minima and maxima. If there is a maxima winthin 50m shallower than a minima, the rest of the depths are flagged.

Physical value test. -2.5°C ><= T <= 42°C

Spike test: no details

Inversion test: no details

Gradient test: fail if gradient > 0.2°C/m and 4σ from climatological gradient

Physical value test. -2°C ><= T <= 40°C

Missing value test. Variable = QC_TEMP_missval

Gradient test: GRAD(k) = T(k)-(alpha1*T(k-1)-alpha2*T(k+1))
alpha1 = (h(k+1)-h(k))/(h(k+1)-h(k-1)) and
alpha2 = (h(k)-h(k-1))/(h(k+1)-h(k-1)),
where h(i) is depth values.
Test applied:GRAD(k) < 10°C, h<=500m
GRAD(k) < 5°C, h>500m
Variable = QC_TEMP_gradient

Spike tests: 1)If mod[(DT(k-1)]>Ttol.or.mod[DT(k)]>Ttol) .and.mod[(DT(k-1)+DT(k)]<0.5Ttol then T(k-1) = fail
2) if mod[DT(k-1)]>0.5TTol.or.mod[DT(k)]>0.5 TTol.and.
there exists k, where GRAD(T(k))>0.05.and.
mod[DT(k-1)+DT(k)]<0.25mod[DT(k-1)-DT(k)] then T(k-1) = fail
3)If mod[DT(k-1)]>0.5 Ttol, and mod[TR]<0.5 TTol and -3Ttol<DT_DW.<0, for depth <250, T(k-1)= fail
where DT(k)=T(k)-T(k-1), Ttol = 5 C if depth <= 500, Ttol = 2.5 if depth > 500
Variable = QC_TEMP_spike

Constant Value test: >=90% of T levels read identical over >=100m = T profile fail

Tropical waters test: if <1000m and <=1°C reject level

Spike tests: 1)If either mod[DT(k−1)] > TTol or mod[D(Tk)] > TTol and mod[DT(k−1) + DT(k)] < 0.5 × TTol then T(k−2) and T(k) are in good agreement with each other, but T(k−1) is rejected as a spike.
2) If mod[DT(k−1)]>0.5 × TTol or mod[DT(k)]> 0.5 × TTol, and at least one of the vertical gradients is larger in magnitude than 0.05 °C/m, and mod[DT(k−1) + DT(k)]< 0.25x mod[DT(k−1)−DT(k)] then T(k−1) is
rejected as a spike.
3) If mod[DT(k−1)]>TTol, and mod[T(k−1)]>0.5 * TTol(interpolated T(k-1) and T(k)), and 0>DT(k−1)>−3×TTol (d<250m), then T(k−2)
and T(k−1) are flagged as suspect.
where DT(k) = T(k) − T(k−1), and TTol = 5°C (<300m), 2.5°C(<500m), 2.0°C(<600m), 1.5°C(>600m). If within 20° of the equator then 200m=300m and 300m=400m. TTol is linearly interpolated from 0m to 300m(400m), step function after that. If >4 T spikes then both T and S profiles rejected.

Variable = PROFILE_POTM_QC

Monoticity of density test: If T and S pass tests, check D(k+1) <= D(k) = fail

Variable = QC_stability

Dρ(k) = ρ(Θ(k) ; S(k) ; P(k))−ρ(Θ(k−1) ; S(k−1) ; P(k)). If Dρ(k)> −0.03 kgm− 3

Density spike test: if mod[Dρ(k−1) + Dρ(k)] > 0.25 x mod[Dρ(k−1)−Dρ(k)] then fail Θ and S at k-1.

If both tests fail then T and S at k and k-1 fail, unless at bottom of profile in which case only k fails. If a profile has 2 or more inversions the profile is discarded.

Year>1997
1<=Month<=12
Day E Month
0<=Hour<=23
0<=Minute<=59

Year is past
Year>1997
1<=Month<=12
Month is past
Day E Month
Day is past
0<=Hour<=23
0<=Minute<=59

1<=Month<=12
Day E Month
0<=Hour<=23
0<=Minute<=59
0<=Second<=59

Observation time must be older than the receipt time at the center

Within 5σ of Levitus Seasonal if close to land and depth < 50m, otherwise within 3σ

Within 3σ of Emery and Dewar climatology

SST within 3σ of Asheville
SST climatology