Ernman has sung Cherubino in Le nozze di Figaro (Staatsoper Berlin/Daniel Barenboim), Rosina in Il barbiere di Siviglia by Rossini (Staatsoper Berlin, Royal Opera Stockholm, Finnish National Opera), the title role in Carmen (Royal Opera Stockholm), Kaja in Sven-David Sandström’s Staden (Royal Opera Stockholm) and Zerlina in Don Giovanni (Staatsoper Berlin/Barenboim).
She has worked with René Jacobs in Berlin, Brussels, Innsbruck, Vienna and Paris in roles like Nerone in Agrippina, Roberto in Scarlatti’s Griselda, Diana in Cavalli’s La Calisto and Nerone in L’incoronazione di Poppea by Monteverdi. She sang Sesto in Handel’s Giulio Cesare at the Drottningholm Festival in 2001 and appeared at the Glyndebourne Festival singing Nancy in Albert Herring (summer 2002) and Orlovsky in Johann Strauß Die Fledermaus (summer 2003).
During the 2003/2004 season Ernman sang Donna Elvira in Don Giovanni at La Monnaie in Brussels and Lichas in Hercules with Les Arts Florissants and William Christie at the Aix-en-Provence Festival (also revived at Opéra National de Paris and at Wiener Festwochen). During the spring and summer of 2005, she created the title role in Boesmans’ Julie at la Monnaie, Wiener Festwochen and in Aix-en-Provence. The spring of 2006 included the title role of Dido and Aeneas (William Christie) in Vienna and Nerone in Agrippina at Oper Frankfurt. In 2006 she made her debut at the Salzburg Festival as Annio in La clemenza di Tito under the baton of Nikolaus Harnoncourt. In 2007 her engagements included Sesto in Giulio Cesare with René Jacobs in Vienna, Cherubino in Le nozze di Figaro with Daniel Harding in Aix-en-Provence and Nerone in L’incoronazione di Poppea in Amsterdam. In 2008 she sang Angelina in La Cenerentola (Royal Swedish Opera) and Dido and Aeneas (W Christie/Opera Comique, Paris). Her 2009 engagements include Angelina in La Cenerentola (Oper Frankfurt and Swedish Royal Opera) and Dido in Dido and Aeneas (Christie/D Warner) in Vienna and Amsterdam.