Santa Cruz Wharf
Wednesday, September 3, 2025
* Quick HAB Observations *:
– Pseudo-nitzschia: Rare
– Alexandrium: Rare
– Dinophysis: Present
– Margalefidinium: Rare
* Impressions *
Despite being sunny and warm over the long weekend, this morning it was overcast and cool. Net tow remains mostly dinoflagellates, but phytoplankton biomass decreased slightly from last week. Prorocentrum remains the most abundant in the assemblage. Pseudo-nitzschia were delicatissima-size and there were only a handful of chains observed. No P. australis or P. multiseries were detected. Alexandrium counts decreased an order of magnitude this week.
Dinoflagellates:
A: Prorocentrum
C: Ceratium
P: Dinophysis
P: Protoperidinium
R: Akashiwo
R: Margalefidinium
R: Alexandrium
R: Polykrikos
R: Boreadinium
R: LRB
R: Oxyphysis
R: Gymnodinium
R: Gyrodinium
R: Pyrophacus
Diatoms:
R: Pseudo-nitzschia
R: Proboscia
R: Eucampia
R: Guinardia
R: Chaetoceros
R: Thalassiosira
R: Rhizosolenia
R: Lauderia
R: Dactyliosolen
R: Coscinodiscus
R: Licmophora
R: Navicula
R: Asteromphalus
Other:
R: Dictyocha
R: Phaeocystis
* Environmental Information *
Time: 8:30 am
Collector: M. Conci
Water Conditions (SCW)
Water Temperature: 16.8 C
Water Conditions: Calm
Water Color/Code: Dark green, 5G 2/6 (#31)
Water Visibility: 9 ft
Tide: Rising, High – 9:38, 3.7 ft
Surf Report: NW swell, 4-6 ft
NDBC buoy 46236
– Significant wave height: 1.0 m
– Swell height/direction: 0.4 m, SW
– Wind wave height/direction: 0.9 m, WNW
Weather Conditions (KudelaHawk)
Sky: Overcast
Air Temperature: 60.4 F (15.8 C)
Wind: 2 mph, W
Solar radiation: 78 watts/m^2
Monterey Wharf II
Wednesday, September 3, 2025
* Quick HAB Observations *:
– Pseudo-nitzschia: Common
– Alexandrium: Rare
– Dinophysis: Rare
– Margalefidinium: Rare
* Impressions *
This morning, conditions were mostly cloudy. The water surface was calm with slight/no breeze. The water color appeared similar to last week, with a visibility of 5 m. Diatoms dominated the water column. Pseudo-nitzschia delicatissima, Chaetoceros, Pseudo-nitzschia seriata, and Prorocentrum were common (10 – 49%). Eucampia, Hemialus, Thalassiosira, Ceratium, and Protoperidinium were present (1 – 9%). The HAB species that were observed in the water this morning included Pseudo-nitzschia, Alexandrium, Dinophysis, and Cochlodinium.
Dinoflagellates:
C: Prorocentrum spp.
R: Dinophysis spp.
P: Ceratium spp.
R: Gonyaulax spinifera
P: Protoperidinium spp.
R: Alexandrium spp.
R: Gyrodinium spp.
R: Polykrikos spp.
R: Cochlodinium spp.
R: Boreadinium cf
R: Oxyphysis
R: Pyrophacus spp.
Diatoms:
C: Chaetoceros spp.
P: Thalassiosira spp.
R: Coscinodiscus spp.
C: Pseudo-nitzschia spp.
R: Ditylum spp.
R: Guinardia spp.
R: Lithodesmium spp.
R: Pleurosigma spp.
R: Rhizosolenia spp.
R: Thalassionema spp.
R: Skeletonema spp.
P: Hemiaulus spp.
R: Lauderia spp.
R: Navicula spp.
R: Cylindrotheca spp.
R: Odontella spp..
R: Asterionellopsis spp.
R: Proboscia spp.
R: Detonula spp.
P: Eucampia
R: Lioloma
Others:
R: Dictyocha spp.
R: Phaeocystis spp. (singletons and clumps)
Zooplankton:
R: Oligiotrich
R: Cilliate
R: Acantharians
* Environmental Information *
TIME: 0720 PT
COLLECTOR: Elise Tysdal
Water Temperature: 15.5°C
Water Conditions: calm
Water Color: 5GY 2/2
Visibility: 5.0 m
Tide: Rising, 0.88 m, high at 0944h
Sky: cloudy, 95% cloud
Air Temperature: 16.11°C
Wind: offline, 0.45m/S
Rare (R): <1% ~~~ Present (P): 1 – 9% ~~~ Common (C): 10 – 49% ~~~ Abundant (A): >= 50%