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Atmospheric aerosols and their effect on clouds are thought to be important for anthropogenic radiative forcing of the climate, yet remain poorly understood1. Globally, around half of cloud condensation nuclei originate from nucleation of atmospheric vapours2. It is thought that sulfuric acid is essential to initiate most particle formation in the atmosphere3,4, and that ions have a relatively minor role5. Some laboratory studies, however, have reported organic particle formation without the intentional addition of sulfuric acid, although contamination could not be excluded6,7. Here we present evidence for the formation of aerosol particles from highly oxidized biogenic vapours in the absence of sulfuric acid in a large chamber under atmospheric conditions. The highly oxygenated molecules (HOMs) are produced by ozonolysis of α-pinene. We find that ions from Galactic cosmic rays increase the nucleation rate by one to two orders of magnitude compared with neutral nucleation. Our experimental findings are supported by quantum chemical calculations of the cluster binding energies of representative HOMs. Ion-induced nucleation of pure organic particles constitutes a potentially widespread source of aerosol particles in terrestrial environments with low sulfuric acid pollution.
Cyrea Gordon and Canepari (121 species) and Tiphysa Mulsant (2 species) are discussed, species are described, illustrations are provided, and a key to all recognized species is included. New synonyms recognized are:
Hyperaspis arrowi var. darwini Brèthes = Cyrea arrowi (Brèthes); Hyperaspis trivittata Weise, Hyperaspis mundula Weise = Cyrea emiliae (Mulsant); Cleothera scapulata Mulsant, Cleothera mercabilis Mulsant, Hyperaspis iheringi Weise = Cyrea flavoguttata (Mulsant); Cleothera gracilis Mulsant = Cyrea hexastigma (Mulsant); Cleothera triacantha Mulsant = Cyrea novemsignata (Herbst); Cleothera distinguenda Mulsant = Cyrea ormanceayi (Mulsant); Cleothera sexnotata Brèthes = Cyrea quinquenotata (Mulsant); Cleothera schaufussi Vogel and Hyperaspis adelaida Gorham = Cyrea tessulata (Mulsant). A total of 76 new species of Cyrea are described: Cyrea agnes, C. allison, C.alma, C. annette, C. arlene, C. audrey, C. beatrice, C. bernice, C. bessie, C. brittany, C. carla, C. charlene, C. claudia, C. colleen, C. constance, C. courtney, C. dana, C. dolores, C. dora, C. eileen, C. ella, elsie, erica, georgia, gertrude, gina, glenda, heidi, holly, ida, jackie, jeanne, jeannette, jessie, jo, C. joy, C. june, C. katie, C. kristen, C. laurie, C. lillie, C. lucille, C. lucy, C. lydia, C. marcia, C. marian, C. marion, C. marlene, C. mattie, C. maureen, C. maxine, C. melanie, C. melinda, C. minnie, C. natalia, C. nellie, C. pearl, C. pseudospinalis, C. renee, C. roberta, C. rosemary, C. samantha, C. stacy, C. stella, C. sue, C. tamara, C. tanya, C. tara, C. terry, C. vanessa, C. vera, C. vicki, C. viola, C. vivian, C. willie, C. wilma, C. yolanda, C.
yvonne. Lectotypes here designated for C. collaris, C. compta, C. distinguenda, C. exclamationis, C. fasciata, C. ferruginiceps, C. flavoguttata, C. iheringi, C. languida, C. maculosa, C. melaneura, C. mundula, C. noticollis, C. novemsignata, C. ormanceayi, C. ornaticolis, C. quinquenotata, C. renifera, C. schaufussi, C. sexguttata, C. spinalis, C. tessulata, C. trepida, C. triacantha