Marine microgels as a source of cloud condensation nuclei in the high Arctic.

Marine microgels play an important role in regulating ocean basin-scale biogeochemical dynamics. In this paper, we demonstrate that, in the high Arctic, marine gels with unique physicochemical characteristics originate in the organic material produced by ice algae and/or phytoplankton in the surface water. The polymers in this dissolved organic pool assembled faster and with higher microgel yields than at other latitudes. The reversible phase transitions shown by these Arctic marine gels, as a function of pH, dimethylsulfide, and dimethylsulfoniopropionate concentrations, stimulate the gels to attain sizes below 1 µm in diameter. These marine gels were identified with an antibody probe specific toward material from the surface waters, sized, and quantified in airborne aerosol, fog, and cloud water, strongly suggesting that they dominate the available cloud condensation nuclei number population in the high Arctic (north of 80°N) during the summer season. Knowledge about emergent properties of marine gels provides important new insights into the processes controlling cloud formation and radiative forcing, and links the biology at the ocean surface with cloud properties and climate over the central Arctic Ocean and, probably, all oceans.

Predictors of patient and caregiver distress in an adult sample with bipolar disorder seeking family treatment.

Little is known about the potentially unique sources of distress in populations seeking family-oriented treatment for bipolar disorder. The present study aimed to characterize this new treatment population by measuring depression, anxiety, quality of life, knowledge of bipolar disorder, therapeutic alliance, and mental illness stigma in 43 bipolar patients and 41 caregivers at family treatment intake. In all, 50% of patients and 27.6% of caregivers had significant depressive symptoms, whereas 51.2% of patients and 45.5% of caregivers had significant anxiety symptoms. Caregiver anxiety was inversely related to patient anxiety, stigma, and poor alliance. Treatment nonadherence was associated with more anxiety and stigma in patients and less anxiety in caregivers. In summary, family-oriented bipolar treatment seekers are significantly distressed at intake, and may benefit from lowering anxiety and stigma in patients and raising awareness and concern in caregivers. Future research should further clarify the complex relationships between caregiver and patient symptoms and attitudes.